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Laptop inverter boards (also know as LCD inverter, FL inverter, screen inverter, backlight inverter) come in different shapes and sizes. On the picture above you see some typical looking inverter boards found in laptop computers.

The inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. The inverter board converts low voltage DC power (few volts) supplied by the motherboard to high voltage AC power (few hundred volts) needed for the backlight lamp. When the inverter board works properly, the backlight lamp gets power and the LCD screen lights up. As a result, the image on the screen is bright. HOW INVERTER CONNECTED TO LDC SCREEN On the picture below you can see a typical laptop display assembly which includes the LCD screen, video cable and inverter board. One side of the inverter board connects to the backlight lamp and another side to the video cable (LCD screen cable). HOW INVERTER MOUNTED INSIDE LAPTOP DISPLAY PANEL In most laptops the inverter board is mounted below the LCD screen as it shown on the picture below.

You can get an access to the inverter board when you remove the screen bezel – a plastic frame around the LCD screen. TYPICAL INVERTER FAILURE SYMPTOMS Usually inverters fail in one of the following ways: 1. When you turn on the laptop, the screen lights up for a short period of time and then goes dark. You still can see an image but it is very dark, almost invisible and definitely not usable. When you restart the laptop, the screen lights up and then goes dark again.

The laptop works fine with an external monitor. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline.

The laptop works fine with an external monitor. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again. Inverter failure symptoms are very similar to backlight lamp failure symptoms and in most cases you cannot tell which one is causing the problem until you replace either the inverter board or the backlight lamp. From my personal experience, inverter boards fail more often than backlight lamps. If you have to guess, replace the inverter first. William Silva, HP Pvilion DV9000 has a problem with all of the white on the screen being “pink” and fuzzy looking.

I have tried a different video card and it looks the same. I assume this problem appears even before Windows starts loading. It’s not software related, right?

From my experience I can tell that pinkish tone on white backgrounds might indicate a problem with the backlight lamp but you also mentioned that the image is fuzzy looking and that could be a problem with the LCD video cable. You can try replacing the video cable. Before you replace the cable, try reseating connectors on the motherboard and LCD screen.

Maybe it’s just a connection related issue. Test the laptop after you reconnected the cable. If a new cable will not fix the problem, I guess you’ll have to replace the LCDs screen. Adam, I have an issue with my HP Pavilion dv9000 that matches the symptoms of a typical inverter failure (the first description). I ordered a new inverter from HP and installed it and it is still having the same issue. What should be the next thing I replace? You are correct.

If you installed a new inverter board but still experience the same problem, probably it’s a bad backlight lamp. It’s not easy to replace the backligth lamp and you can damage the screen, so it might make sense to replace the whole LCD. Mitul, When I start my laptop, for a fraction of second Ill get the light on the screen but after that it will become dark( But still everything will display on the screen. Is it possible that for a fraction of second I am getting backlight it means lcd bulb is fine but the inverter is bad?? You cannot tell without testing the laptop with another working inverter or backlight lamp. Could be either one. If you have to guess, go with the inverter first.

It’s way easier to replace and is shouldn’t be very expensive. Duc, I have a hp compaq 8510p, and it have problem with inverter. I was trying to replace inverter, but unfortunately I couldn’t find any store sold hp compaq 8510p inverter. The best way to find a new compatible inverter would be searching by the HP spare part number from the old inverter. Take a closer look at the original inverter. Can you see the spare part number on it? Google this number.

According to the HP hardware and service guide for HP Compaq 8510p notebook PC, there is only one inverter listed for this model. Here’s the part number: 452214-001 Google this part number and you’ll find your inverter. Hello, in august 2006 I bought a Pavilion DV6560EL. I never had a problem with it until a couple of months ago, when I noticed a slightly reduced brightness of the lcd panel, but I didn’t think too much at it since I wasn’t really sure about it. Then, some weeks ago, I started experiencing another annoying problem: basically, at random periods, the screen starts flickeringin other words, brightness increases and diminishes itself just a little bit for some seconds and then returns at the right level.

I have to say that, sometimes, when the laptop comes back from hibernation, I can’t change the brightness level either from keyboard or vista’s “laptop center” applet (in these situations it disappears from the panel!!), but I really don’t know if it’s a problem related to the flickering. I sent an email to HP support describing the problem and they answered that I should try unplugging the power cable for about two hours, then press the power button for a minute, and finally replug the power cable, I tried it but it’s always the same. Could it be an inverter problem? Thanks, and compliments for the great website! Gianni, I started experiencing another annoying problem: basically, at random periods, the screen starts flickeringin other words, brightness increases and diminishes itself just a little bit for some seconds and then returns at the right level.

Your problem could be related to the DC-IN power jack – the socket where you plug in the power adapter. It’s possible that the power jack is loose or broken and the laptop intermittently looses connection with the AC adapter and switches between AC mode and battery mode. Apparently the screen becomes dimer when the laptop switches to the battery mode because the screen brightness is set to lower level for this mode. Here’s what you can do. Plug in the AC adapter and wiggle the plug inside the power socket. Does the laptop looses AC power when you wiggle the plug?

Does the LCD screen flicker when you wiggle the plug? If it does, your problem could be related to the DC jack or maybe the AC adapter has a damaged cord. If there is nothing wrong with the power socket and the laptop not loosing power when you wiggle the adapter plug, there is a chance that you have a faulty inverter board. By the way, check out the link I posted in the comment #11. Maybe your dv6560 qualifies for a free repair. When ever I fire up my laptop I have to wiggle the screen back and forth to get the image to stay on the screen. Once you get it into just the right place the display is fine.

It continously freezes though till you wiggle it again then it will pick up wherever you are. The issue has continously gotten worse. If you mess with it enough eventually you get all lines and a crazy display. Does this sound like a screen or a wiring issue? I already checked where the video cord plugs into the motherboard. Warranty is out and I need my laptop back!

I have a dead acer laptop with (what I thought was) a working screen. I had a customer with a Compaq laptop with a nearly identical lcd screen that was cracked. I tried connecting my screen to the compaq, but no video came up and the inverter seemed to start to heat up. I immediately powered it off and later tried plugging it back into the dead acer (bad ata controller, actually works with usb boot media) now I get no video whatsoever on the LCD but external monitor works fine. Have I fried my LCD screen and/or inverter? Any thoughts appreciated •. Joey, When ever I fire up my laptop I have to wiggle the screen back and forth to get the image to stay on the screen.

Once you get it into just the right place the display is fine. It continously freezes though till you wiggle it again then it will pick up wherever you are. The issue has continously gotten worse.

To me that description sounds like a problem with the LCD cable, apparently it’s defective and has to be replaced. I guess could be a problem with the LCD, but for some reason it feels like bad cable.

If you mess with it enough eventually you get all lines and a crazy display. By the way, did you test the laptop with an external monitor? Can you tell if the external video output works fine even though the internal video fails? If you are getting the same exact problem on both the internal and external screens, there could be a problem with the video card. It’s possible that when you are moving the display, you are actually flexing the motherboard and temporarily fixing the problem.

Test your laptop with an external monitor and let me know if it fails the same way as the internal screen. ACH, I get no video whatsoever on the LCD but external monitor works fine. Have I fried my LCD screen and/or inverter? Any thoughts appreciated First of all, check the cable connection.

Maybe it’s not plugged correctly. Try reconnecting the video cable. When you moved your LCD screen to the Compaq laptop you tried to turn it on with the customer’s inverter, right? It means, your inverter board stayed connected to the Acer and you couldn’t damage it. Am I missing something?

Take a closer look at the LCD on your Acer. Is it completely blank and black? Can you see any faint image at all?

If you cannot see any image and reconnecting the video cable doesn’t help, apparently you damaged the screen when tested it with the Compaq laptop. Even though both LCD screens look very similar, they might require different video cables. Connecting a good working LCD screen to a laptop with incompatible video cable can damage the screen. Repair guy I took the bevel from around the screen off today as well as the plastic piece from above the keyboard. I fired it up and wiggled and messed with all the wires. Moving wires did nothing but as I moved the screen the display would change.

It’s totally out now. I have an S video cord connection on my machine but last time I messed with it I had to set it up on the settings so I don’t know if I can just plug it in and get it to work on my TV to test it. BTW the machine is a HP DV5000 series. It’s about 2 years old. Joey, I fired it up and wiggled and messed with all the wires.

Moving wires did nothing but as I moved the screen the display would change. Apparently it’s a bad screen. I have an S video cord connection on my machine but last time I messed with it I had to set it up on the settings so I don’t know if I can just plug it in and get it to work on my TV to test it. It’s easier to test with a desktop monitor.

Can you find a monitor for the test? You cannot tell if it’s a bad screen or motherboard until you test the external video output. Bradley, is there anyway I can check whether power is getting to the inverter. I think it’s possible to check voltage with a multimeter on the left side of the inverter board where it’s connected to the LCD cable. I believe you have to measure voltage between pin 1 and ground, but I’m not sure 100%.

You’ll have to get some low voltage DC readings. If there is no incoming voltage, it could be bad LCD cable or motherboard.

Did you try reconnecting the LCD cable connection on the motherboard? Maybe it’s loose connection?

Bradley, I’ve measured the voltage on the left hand side, not quite sure which is pin1 and ground but I do get a reading of 3 volts implying power is getting to the inverter I’m not sure but 3 volts seems to be low. I don’t have a multimeter with me and cannot confirm if that voltage is correct.

Maybe the new inverter I’ve bought is dead? It’s possible. I’ve seen that happening before. Did you but it from a reliable source?

Is it easy to get to the motherboard connection? It depends on the laptop model. On some laptops this connector could be found under the keyboard bezel. On other models it’s located under the keyboard.

Do I have to take the all the back off? No, but you’ll have to remove the keyboard bezel and maybe the keyboard too. If power is getting to the inverter is it neccesary to check the connection to the motherboard. In your case it looks like the power is getting to the inverter, so I assume the cable is seated correctly. Again, 3 volts seems to be low. I believe when I tested it last time (a couple of years ago), I was reading over 9 volts. By the way, do you have a display close switch on your laptop – a small button usually located close to one of the hinges.

When the display is closed, the button is pressed down and there is no voltage going to the inverter. Check the button. Maybe it’s dirty and got stuck inside the case and the laptop “thinks” the display is closed even though it’s open. Gareth Bradley, Original fault was cracked LCD, the backlight did work it was just the screen that was cracked, I’ve still got it and plugged it back in but the backlight on that will not light up. If I understand correctly, you bought a new LCD screen but the backlight will not light up? Try installing the old (cracked) screen back into the laptop.

Will it light up? If the backlight works fine on the cracked screen but not on the new one, apparently it’s either defective LCD screen or the screen is not compatible with the laptop. Roman, Whenever I have my laptop plugged in to the AC Adapter, my backlight will eventually turn off and will not turn on until after I have restarted or place the computer in sleep mode.

However, when it runs on battery, I have yet to see my backlight turn off. Could this still be an inverter problem? It’s hard to tell which one is causing the problem, the backlight lamp or inverter board. Here’s what you can try. Try reducing the LCD screen brightness for the AC mode (when the AC adapter is plugged in). On some laptops you can do that through the power management software in the control panel, on other laptops you can do that through a keyboard shortcut or in the BIOS settings. Make the LCD screen a little bit dimmer when the laptop is plugged into the adapter.

Will it help the backlight to stay on all the time or it still turns off even thought the brightness is reduced? I’ve got an HP DV6000. When I power it on, I get nothing on the screen.

Totally black. I pulled the panel off and I thought where the main flat LCD cable plugs into the motherboard, the wires in the cable might have gotten pinched or something becuase I saw the screen come on once or twice when working on it. I replaced the LCD’s ribbon cable and tested it and it fired up fine. I re-assembled the laptop and now there’s nothing on the screen again.

I was very gentle with the cable when re-assembling. Furthermore, nothing appears on an external monitor when the laptop is powered on.

The external LCD screen just sits there in power save mode. I’ve tried on both AC and battery power and nothing.

I wouldn’t think it’s the internal video device because I’ve seen the screen work. I guess I could always be wrong though If you have any ideas please help! Drew, I’ve got an HP DV6000. When I power it on, I get nothing on the screen. Totally black Furthermore, nothing appears on an external monitor when the laptop is powered on. The external LCD screen just sits there in power save mode. If both the internal and external video do not work, your problem is not related to the display panel.

It could be either bad memory or motherboard. Try reconnecting memory modules. If you have two modules, remove them one by one. Test the laptop with each module separately.

This is great news! I have a Dell Inspiron 6000 that does exactly what you described in failure symptom #1. My laptop screen stays on for about 30 secs after reboots then goes black. It also comes back on if I close the display lid and reopen it, but only for 30 secs. Could this be related to the Lid Close Switch? Computer works fine with an external display.

I’m guess I’ll try to check the switch 1st. If that doesn’t work I’ll try to replace the inverter and bulb if necessary. Where can I buy these parts?

Great article! I have a Compaq nx7300 (1.5 years old) and recently, I dropped my laptop on the ground. When I turned it back on, the screen was very dim although I can still see the images. I tried to adjust the dimmer but it didn’t lighten the screen. I then hooked the computer up to an external monitor and the image was able to display properly on the external monitor. I tried getting help from the tech support at my college, but they didn’t really do much and they told me that most likely it would cost 400 dollars to fix it. Unfortunately, it’s out of my budget.

After reading about inverters and backlights, I am wondering if something is wrong with the inverter and if there could also be something wrong with the backlight. What would you advise me to do? Justin Lancaster, My laptop screen stays on for about 30 secs after reboots then goes black. It also comes back on if I close the display lid and reopen it, but only for 30 secs. Could this be related to the Lid Close Switch? I don’t think so.

Sounds like a faulty inverter board or bad backligth lamp. I’m guess I’ll try to check the switch 1st. If that doesn’t work I’ll try to replace the inverter and bulb if necessary.

I would definitely try replacing the inverter first. Where can I buy these parts? You can find a new inverter or LCD with inverter for Inspiron 6000 on ebay. Jun, I dropped my laptop on the ground. When I turned it back on, the screen was very dim although I can still see the images. I tried to adjust the dimmer but it didn’t lighten the screen. I then hooked the computer up to an external monitor and the image was able to display properly on the external monitor.

Most likely you damaged the backlight lamp. After reading about inverters and backlights, I am wondering if something is wrong with the inverter and if there could also be something wrong with the backlight. What would you advise me to do? You can check the cables connected to the inverter board and try reconnecting.

Maybe one of the cables is loose. If it doesn’t help, apparently your failure is related to the backlight lamp.

The backlight lamp is mounted INSIDE the LCD screen and it’s very hard to replace. If you’ve never done it before, I would recommend replacing the whole LCD screen. You can find a new screen for your laptop on ebay, it’s about $60-70. You’ll find display disassembly and LCD replacement instructions in the maintenance and service guide for HP Compaq nx7300 and nx7400 notebooks. Hi, My compaq nx7400 no longer lights up.

I spilled a little water on the back of the screen cover, while it was closed, and since then it will not illuminate. If held at the right angle i am able to barely make out whats on the screen. Also, it works fine hooked to an external monitor. I read some of your previous posts and went ahead and took the screen apart. When I looked at the inverter it seemed to have a little bit of a build up on some of the solder. I am assuming the water made its way into the inverter somehow but am not sure.

I hooked up a meter and there is power to it. I have ordered an inverter and a new bulb. Any other suggestions as to what it may be? James, The backlight on my Dell Inspiron 8500 went black, but barely viewable, the other day.

After some research, it sounded like an inverter problem as it usually works for about 30 seconds after a reboot then goes black and an external display works perfectly fine. I bought an inverter from a local laptop store and it still wouldn’t work.

I even brought it back for a replacement and I still have the same result. Any thoughts or suggestions as to where I could find the right hardware?? Most likely your problem is related to the backlight lamp which is located inside the LCD screen.

You can try replacing the backlight lamp yourself but it’s not easy. If you cannot do that, I would suggest replacing the whole LCD screen. Karl dela cruz novoselic, a friend brought a compaq c500 laptop to us for repair, the problem is the white,moving lines which is about 1 centimeter thick. I don’t know if the word “fuzzy” is a right adjective for it. But when i disassembled the unit and reseated the display cable, the display was divided or tiled into 4 parts and when i tried reseating it again the display was totally lost (display on an external monitor is fine). I think there is a problem with the LCD screen. With a bad cable you can get distortion on the screen but it would not divide the screen into 4 images.

Further reseating didnt solve the problem and i am thinking that it might be related to the inverter or the display cable.any ideas? When inverter fails, you still should be able to see a very faint image on the screen. Hey Repairman, First thanks for your help, this site is great! I got the inverter board in and replaced it and now the screen doesn’t come on at all. I can still see a faint image if I shine a flashlight at the screen though.

What should I do? Try to replace the bulb next? I also tried putting the old inverter board back in and it does the same thing, doesn’t light up at all. Before I replaced it, it would come on for about 10-30 seconds and shut off. The screen also had a reddish glow to it.

Thanks in advance! Justin Lancaster, I also tried putting the old inverter board back in and it does the same thing, doesn’t light up at all. Before I replaced it, it would come on for about 10-30 seconds and shut off. Hard to tell why it’s doing that. It’s possible you damaged the old inverter while replacing it with a new one. I cannot tell without testing your laptop with a KNOWN good inverter. Also, it’s possible that finally your backlight failed.

The screen also had a reddish glow to it. If the screen has reddish glow, most likely it’s related to a failing backlight lamp. First, congratulations for the site. I found some very valuable information. I have a compaq evo n800c with a strange problem. The display (LCD) activates only one colum every 2 colums (consecutive colums, if “1” is on and “O” off, it looks like 101010).

Overall it looks like a loss in resolution. It is independent of the resolution selected for the video. I have dismounted the screen and (while powered on) disconnected the LCD. The result was a perfect white screen.

When connected to an extenal monitor, it works fine. Can you help me identify the source of the problem? Thank you in advance. Guillermo, The display (LCD) activates only one column every 2 columns (consecutive columns, if “1″ is on and “O” off, it looks like 101010). Overall it looks like a loss in resolution.

It is independent of the resolution selected for the video. I have dismounted the screen and (while powered on) disconnected the LCD. The result was a perfect white screen.

When connected to an external monitor, it works fine. OK, let’s go through your problem step by step. The external monitor works fine and the image on the external monitor is displayed properly. That tells me the motherboard and video card works properly. When you unplug the video cable from the LCD screen it turns completely white. The screen is bright and that means the inverter board and backlight work properly.

I don’t think that your problem is related to the LCD cable. From my experience, LCD cables do not fail like that. When the cable fails, the whole image gets garbled or the screen doesn’t turn on at all. I think your problem is related to the LCD screen. Hey repairman, I have a laptop where the screen comes on for 1-5 seconds after boot and has a red tint to it. Have you ever seen the reddish tint caused by an inverter or is it always the backlight?

Second, I’m debating whether to get the light or the whole screen. I had a customer get an lcd screen from ebay before and it had a horribly obvious bright pixel. Do you have a vendor you like that sells higer quality screens and parts and are there any that I definitely shouldn’t use? The screens on ebay for this Toshiba a135 go for around $60 and it would be easier than replacing the lamp, but the customer probably won’t be happy if the screen is defective.

Also, if I do get the whole lcd and it is defective can I at least use its lamp? Karl dela cruz novaselic, i cant see any display on the screen even when i used a flash light to illuminate it so probably the lcd inverter is not defective. Yep, your description in the previous comment doesn’t sound like a problem with the inverter.

What can you suggest for me to replace first,is it the lcd, the display cable, or better to change them both? It’s up to you. But in my opinion you have a problem with the LCD. I could be wrong. You can search for the whole display assembly (LCD screen, inverter, cable, plastic covers, etc) If you can find one, you simply unplug the old display assembly and install a new one. I tried looking for a part number on the lcd and the display cable but i couldnt find one.

Do you have a white sticker glued to the video cable somewhere close to the connector which plugs into the system board? HP usually places the part number on that sticker. Look for the SPS number. If you can find it, most likely it’s the part number for the whole display assembly. Google the part number to make sure what it is. Mark, I have a laptop where the screen comes on for 1-5 seconds after boot and has a red tint to it. Have you ever seen the reddish tint caused by an inverter or is it always the backlight?

From my experience this is a problem with the backlight lamp. I had a customer get an lcd screen from ebay before and it had a horribly obvious bright pixel. Can he return the screen for an exchange? There are a lot of good sellers on eBay. I’m debating whether to get the light or the whole screen.

The screens on ebay for this Toshiba a135 go for around $60 and it would be easier than replacing the lamp, but the customer probably won’t be happy if the screen is defective. I would definitely replace the whole screen. Replacing the backlight lamp is very labor intensive. You can put a few hours into the repair and there is no guaranty it will work. I can replace the backlight lamp for fun or for my own screen but I never offer this repair to my customers. It takes too much time.

Just explain to the customer that replacing the whole screen is way cheaper. Also, if I do get the whole lcd and it is defective can I at least use its lamp? It depends on what is defective. If it has a bad controller board (image is missing, garbled, has vertical lines) but lights up, it means the backlight lamp works properly and you can use it for another screen or as a test equipment. Shilp, i am highly confused and not able to decide whether the problem is in lights or inverter.

Still.while turning on the system my computer starts with florescent green color earlier it used to be blue and black)screen. If the laptop screen lights up and you can see an image (even if it’s garbled), your inverter and backlight work properly. When inverter or backlight lamp fail, the screen is completely dark. I can see these green florescent tints on the desktop screen too. So, you are getting some green tint on both internal and external screens? That sounds like a problem with the video card.

It’s very likely that your internal LCD screen doesn’t work because of a problem with the video card. Been searching and haven’t found a symptom close to mine.

I am working on a Dell Inspiron 6000. It’s first problem was a black horizontal line covering the 1/3 bottom part of the screen. Picture was fine on top. External monitor worked great. So I changed the screen.

Now, at power on, the screen is fuzzy multi-color can’t see bios startup. Can see desktop but unable to read letters, very fuzzy and graphics look worse than safe mode. Now if I restart the computer, the screen goes to normal. I noticed that the inverter shows compatible p/n, and the screen I used to replace is not listed.

Could that be the problem? The replacement screen p/n is LTD154EX0V. Hello I have a hp pavillion dv2275ea laptop I dropped the laptop and the screen cracked so I replaced the screen with a new one and it is very dim, I replaced the laptop with the old cracked screen again and its also dim does this mean that i should replace the inverter with a new one?

And what could hace caused the inverter to go bad static from my fingers while I replaced the screen because i changed the screen while it was all powered up or do i need to change any settings as laptop was connected to external monitor for a week or so? Hey Repair Man. I have a HP-Compaq NC2400 in which the screen shows color although with red tint for about 5-10 seconds, afterward, it turns dark although everything still work, internet, et cetera, all still working. The same thing happen every time I restart my laptop. I’ve read your post and the comments here in general and so I just want to confirm.

At first I thought it was my LCD inverter that went wrong, but now I started to get confused whether it is my backlight that is wrong. So, which is it? Thanks in advance •. Nico, I am working on a Dell Inspiron 6000.

It’s first problem was a black horizontal line covering the 1/3 bottom part of the screen. Picture was fine on top. External monitor worked great. That could be poor connection between the video cable and motherboard, defective video cable or bad LCD screen. So I changed the screen.

Now, at power on, the screen is fuzzy multi-color can’t see bios startup. Can see desktop but unable to read letters, very fuzzy and graphics look worse than safe mode. Open up the display panel so you can access the video cable behind the screen. Now turn on the laptop and when you get image on the screen carefully touch/move the video cable. Does it make any difference? I noticed that the inverter shows compatible p/n, and the screen I used to replace is not listed.

Could that be the problem? The replacement screen p/n is LTD154EX0V. I don’t think that your problem is related to the inverter board. In your case the screen lights up and is bright.

That means the backligth lamp and ivnerter work properly. Nope, it’s not the inverter problem.

Here are some troubleshooting tips: 1. Check connection between the video cable and motherboard. Make sure it’s plugged in correctly. Reconnect the cable just in case and test the laptop again. Try connecting the old LCD screen back to the laptop. If you still experience the same problem with the old screen (the bottom part doesn’t work) but your new screen has a different problem (fuzzy image), the new screen is either incompatible with the laptop or is bad.

Did you try connecting the old screen? Try replacing the video cable.

Nick singh, I have a hp pavillion dv2275ea laptop I dropped the laptop and the screen cracked so I replaced the screen with a new one and its very dim I replaced the screen with the cracked screen again and its also dim should I replace the inverter with a new one First of all, make sure the video cable is properly connected to LCD screen, inverter board, motherboard. It’s possible that you accidentally pulled the cable while replacing the screen. Try reseating the cable. What could hace caused the inverter to go bad static from my fingers while I replaced the screen? Yes, it’s possible. Check the connection.

Replace the inverter. Linda, I have a HP-Compaq NC2400 in which the screen shows color although with red tint for about 5-10 seconds, afterward, it turns dark although everything still work, internet, et cetera, all still working. The same thing happen every time I restart my laptop. Your description sounds like a problem with the backlight lamp inside the LCD screen. I’ve read your post and the comments here in general and so I just want to confirm. At first I thought it was my LCD inverter that went wrong, but now I started to get confused whether it is my backlight that is wrong.

So, which is it? From my experience, the red tint on startup can be cause by a faulty backlight lamp. Inverters do not fail this way. I have a Dell Inspiron e1505 has worked fine with NO faults until this morning.

I get up and the screen is pitch black. I restart the computer and I will get about 10-15 seconds of full color then straight to black. Several hours later I notice that I’m getting a “shadow” of my screen showing in the background when I was thinking it was black. From reading a handful of pages this sounds like an inverter – am I correct in thinking so? I am able to get little flickers of full color (1-2 seconds tops) if I close the lid then re-open the lid. I’d love to be able to do the repair myself and save a few $$s but I’ve never worked on my laptop and I have all the files for my company on it.

Unfortunately I haven’t backed it up in a few weeks either. I can tell everything is there, but I’m worried that if I tried to do the repair myself I’d mess it up.

Is this the sort of repair that I can entrust to Geek Squad? Also, would I be better off ordering an inverter myself or just buying it through them?

Elissa, I have a Dell Inspiron e1505 has worked fine with NO faults until this morning. I get up and the screen is pitch black. I restart the computer and I will get about 10-15 seconds of full color then straight to black. Several hours later I notice that I’m getting a “shadow” of my screen showing in the background when I was thinking it was black. From reading a handful of pages this sounds like an inverter – am I correct in thinking so? I am able to get little flickers of full color (1-2 seconds tops) if I close the lid then re-open the lid.

It’s either a bad inverter board (which is most likely) or faulty backlight lamp (which is less likely). If you have no test equipment and have to guess, i would definitely try replacing the inverter board first. You don’t have to remove the whole display panel, it may stay attached to the laptop. Go straight to the Removing the Display Bezel instructions. As you see, the inverter board is attached to the bottom of the LCD screen. You’ll have to figure out how to remove the inverter and replace it with a new one.

I’d love to be able to do the repair myself and save a few $$s but I’ve never worked on my laptop and I have all the files for my company on it. Unfortunately I haven’t backed it up in a few weeks either. I can tell everything is there, but I’m worried that if I tried to do the repair myself I’d mess it up.

Replacing the inverter board shouldn’t mess any data on the hard drive but if you don’t feel comfortable doing that, take the laptop to a repair shop. By the way, you can remove the hard drive from the laptop and install it into an external USB enclosure ($20-30 in a local computer store). After that you connect this enclosure to another working computer and access your data. Mark, Hi, my Toshiba Satellite M105-S3041 has developed an issue where the screen dims when the screen is moved up and down or due to some vibration, there is also a buzzing noise when this happens.

I have to move the screen around normally to correct it. Does this sound like I need to replace the screen inverter? Or could it be the video cable that is faulty? Or something else? It’s normally fine when there is no physical movement.

That could be: 1. Loose connection between the video cable and LCD screen or inverter board. Try reconnecting the cable first. Bad video cable. I don’t think that your problem is related to the inverter because you can fix it by moving the display. Hi, I have an issue with my Dell e6400.

I dropped it, the screen broke with only half of it still displaying properly. I bought a new one from LCDWORLD on ebay and it works great, IF I’m plugged into AC. Trying to start up the laptop on battery will result in a blank screen while starting up on AC works fine. After the laptop is started up, I can disconnect the AC power and the screen will stay on. Could it be the inverter?

Why does the screen stay on even after unplugging from the wall? Thanks, Franco •. John V, I believe my dv9000 is experiencing the issues described above Which one? No backlight? The only issue that has me wondering whether or it is the board itself is that when I plug an external display, I’m only able to view a broken image by booting into Safe Mode.

If you get a garbled image on the external monitor, most likely your problem is related to the video card. The screen inverter board cannot affect image on the external monitor at all.

The image has broken lines and a bit distorted. Again, if you are talking about the image on the external monitor, it sounds like a problem with the video card. Franco, I have an issue with my Dell e6400.

I dropped it, the screen broke with only half of it still displaying properly. I bought a new one from LCDWORLD on ebay and it works great, IF I’m plugged into AC. Trying to start up the laptop on battery will result in a blank screen while starting up on AC works fine. After the laptop is started up, I can disconnect the AC power and the screen will stay on. Did you replace just the LCD screen or the new screen came with the inverter board? Have you tried connecting the old (broken) screen back to the laptop and test if it lights up properly from the AC adapter and battery? Hi, I have a Toshiba Satellite M105 S3004 laptop with a 14 inch LCD Display.

The screen in my laptop is very dark but i can see the images still being there. However, if i put the screen down for standby and open it back up, the screen becomes brightes for a few seconds and gets dark again.

Is this a problem with the backlight or the inverter or any other component. Additionally, when it does light up, the right side of the screen is brighter than the left side. Is this all becasue of the same problem? Will really appreciate your help.

John, The screen in my laptop is very dark but i can see the images still being there. However, if i put the screen down for standby and open it back up, the screen becomes brightes for a few seconds and gets dark again. Is this a problem with the backlight or the inverter or any other component. It’s hard to tell which one is failing. It’s either bad inverter or backlight.

Both parts have very similar failure symptoms. In order to find out which one is causing the problem you’ll have to replace the inverter board ortest the laptop with a known good backlight lamp. Additionally, when it does light up, the right side of the screen is brighter than the left side. Is this all becasue of the same problem? Now that sounds more like the backlight lamp failure. Hi.I have a toshiba laptop EL10-142 working fine except there is no backlight.It works on a external monitor when first turned on but then it returns to the dark laptop screen.I have bought two replacement inverters from ebay but still no joy.When i test them with a multimeter they all have 14.75 dc volts going in at the top pin one end but no ac at the other.I used the laptop as an earth and probed both pins inside.I also probed both pins at the same time as i am not sure of the correct way to test ac current.Should there be power at the backlight end? If so do you think that both replacements could be faulty?

Please help.Thanks Pam. My wife stored a bottle of water with her laptop in the carring case.

Unbeknownst to her, the cap had fallen of the water bottle and the laptop had been sitting in about a 1/4″ of water for about an hour. The laptop was in standby and the backside (where the screen connects to the laptop) was the only part of the computer immersed in the water. After letting it dry thoroughly, we tested the computer. The laptop turns on and works fine with an external monitor. However, the screen remains extremely dark all the time with only a very dim image outline (can be seen with a flashlight).

Do you think it is the inverter, backlight, or both. Thank you for any help you can provide.

Pam, When i test them with a multimeter they all have 14.75 dc volts going in at the top pin one end but no ac at the other. Looks like the power gets to to inverter and the voltage is about right. You cannot test voltage on the other end with a multimeter. If so do you think that both replacements could be faulty? It’s possible but not very likely. I think you have a problem with the backlight lamp inside the LCD screen.

You can test the backlight using the method I linked to in the comment 107. Hello, i have same problem. Change broken screen, tried on external screen, works fine,tried another inverter, same dark screen,tried another screen, same dark screen. Maybe You resolve this problem?

Thanks for your help Viktoras Bobby Says: June 7th, 2009 at 11:49 pm Hi. I’ve changed a broken screen on an HP Pavilion dv5000, first start worked really fine, all light and brite, put all together again and now almost no light, just very dark. Tried on external screen, works fine.

Tried another inverter, same dark screen tried another screen, same dark screen took some more apart and checked the screen cable were seated at board, same dark screen. Now I’m out of ideas!!

Thanks for your help Bobby •. William, When I open my DV9740US HP Pavillion all the way, the black areas become red and dotty, but when I pull the screen towards me (to about where its 70 degrees open) – the screen goes back to normal. Does this sound like a loose connection, or some bigger hardware issue? First of all test you laptop with an external monitor.

Do you see same problem on the external monitor when the laptop display is open all the way? If you do, there could be a problem with the video card.

If the problem appears only on the laptop screen and external video is fine, most likely it’s either cable related problem or bad LCD. You can try reconnecting the cable. Htnakirs, The display shows only lines and a pale gray colour, no image. The inverter is working fine, since with the signal cable unplugged the screen lights up white. That’s right.

If the screen lights up there is nothing wrong with the inverter board. On plugging the signal cable the lines return. I am not sure if it is the cable or the LCD to blame.

Test the laptop with an external monitor. Can you get video on the external monitor?

If you get the same bad image on both screens, there is a problem with the motherboard. Test your laptop with an external monitor first.

Mike, I have a Dell Vostro 1400. The display is just black. It does not work with a external monitor, the same results black screen. I can see the Dell logo when the laptop first boots. I can run the diagnostics, which detects no problems the video test is fine as well. I can see all the patterns.

I can go into the Bios without any problems. After the Dell logo comes up when I first boot the computer it goes black. No beeps or anything. Can you boot in Safe mode? When Dell logo appears on the screen, press F8 and select Safe Mode.

Will it boot this way? Alan, I have a presario c700. My screen has a dim image of my backround in the back but the backlight is not working. It came on for about 5 seconds once but has not worked since. I connected it to aan external display and it worked ok.

Can anyone help??? Could be faulty inverter board or backlight lamp. You cannot tell without testing the laptop with a known good inverter or backlightl lamp. If you have to guess, try replacing the inverter board first.

You have a very good chance to fix the problem. I have a Pavilion DV9700 with a problem of the screen going black after random periods of time and not coming back via the mousepad as it does with display timeouts. Laptop is still running and restart or going to sleep (via start/u/enter) and waking up bring the screen back.

All power settings set to never (this is plugged in). I do notice failure takes much longer if the screen is dimmer. Can’t try external monitor until I get home from this vacation. Watching a movie seems to make it occur faster. Could this still be an inverter problem, or is it the backlight overheating?

Whenever I have a picture, it’s perfect. With backlight a little dim, I can go for hours, sometimes days, doing normal computer stuff (not movies) without a failure. David Dell, I have a Pavilion DV9700 with a problem of the screen going black after random periods of time and not coming back via the mousepad as it does with display timeouts. Laptop is still running and restart or going to sleep (via start/u/enter) and waking up bring the screen back. All power settings set to never (this is plugged in).

I do notice failure takes much longer if the screen is dimmer.Could this still be an inverter problem, or is it the backlight overheating? Could be either one. Cannot tell until you test the laptop with a known good inverter or backligth. Replace the inverter first and if no help, deal with the backlight lamp. Replacing the inverter board is not difficult. Tommy, I recently replaced my laptop’s LCD and it is working fine. The connector to the inverter for the new LCD was not the same as the old one.

So we had to cut the old cable and attach it to the new one to connected. Now I am a bit worried because the screen is a bit brighter than the old one.

Could I have made an error in connecting a non-compatible LCD? It’s possible that the backlight lamp inside the new LCD requires a different less powerful inverter board. Try reducing the screen brightness a little bit. Hi, coffee was spilled on the keyboard of my Dell XPS M1210 laptop. Now it seems to have symptoms of an inverter failure; I’ve verified that it works fine with an external monitor, no pinkish hue, only a very faint display always. This model seems to have a magnetic lid close detector rather than a button.

I’ve bought a used inverter off ebay but same result. I will send it back for another to rule out if it’s a bad one.

Any other considerations? Did the coffee spill cause the inverter to fry most likely and this is common in your experience? I have a Dell Inspiron e1505 laptop. I am trying to determine if it is the inverter or the backlight that needs replacing. Maybe you can tell if I provide more detail on the symptoms? The image degraded over a period of time: for a few weeks, the image got harder to see in the left bottom left corner. A couple of times, the screen went black but then it worked again when I tried later.

Then one day while the system was on, it made a sound, like a zzzzzt and then a pop. The screen went black and hasn’t worked since. Except that it does show the power-on screen and I can see the image on the display with a flashlight. Also, an external monitor works fine. I did notice will using it with an external display a buzzing sound coming from the system but that has stopped now.

Ed, Hi, coffee was spilled on the keyboard of my Dell XPS M1210 laptop. Now it seems to have symptoms of an inverter failure; I’ve verified that it works fine with an external monitor, no pinkish hue, only a very faint display always. This model seems to have a magnetic lid close detector rather than a button. I’ve bought a used inverter off ebay but same result. I will send it back for another to rule out if it’s a bad one. Any other considerations? Did the coffee spill cause the inverter to fry most likely and this is common in your experience?

Most likely your problem is not related to the inverter board. To me it sounds like a problem with the motherboard. Apparenlty, the liquid went down to the motherboard and damged it. You’ll have to remove the top cover and take a closer look at the motherboard. If you see corrosion or any other sign of liquid damage, you’ll have to replace the motherboard. Jodi MacDonald, The image degraded over a period of time: for a few weeks, the image got harder to see in the left bottom left corner. A couple of times, the screen went black but then it worked again when I tried later.

This part of your description sounds like a problem with the backlight lamp but also could be related to the inverter, maybe it’s not providing enough power for the lamp. Then one day while the system was on, it made a sound, like a zzzzzt and then a pop. The screen went black and hasn’t worked since. Except that it does show the power-on screen and I can see the image on the display with a flashlight. This part sounds like a problem with the inverter board.

Last week I repaired one laptop with exactly the same problem description (it made a sound, like a zzzzzt and then a pop). I replaced the inverter board and it fixed it. First of all, I would try replacing the inverter. It shouldn’t be very expensive. If no help, you’ll need a new LCD screen.

Thanks Repair Man, Though I don’t see any signs at all of corrosion it seems there’s no coincidence this issue happened after the spill. Just that the laptop works fine except for the LCD, so I was hoping for a fix based on what I’ve read here. Worst case I guess will be to use it with an external monitor here on out. If you have any other ideas please let me know.

Another inverter is in the mail to try. I was considering getting another LCD to try but not so much now since your response. Thanks again, •. Hello, I’m just asking for some help with my Sony VAIO laptop.There seems to be something wrong with the screen, when I turned it on I wasn’t taken to the startup screen. Instead the screen shows only a portion of the windows telling something with an error.All over the screen, there’s a black leaf shaped thing connected with black lines. A large part of the lower screen is white, which is sepearated by black lines with the others (the left side of the screen is gray and a small portion where you can see the desktop cursor can be located at the top.) Does anyone know about this? Kaye, when I turned it on I wasn’t taken to the startup screen.

Instead the screen shows only a portion of the windows telling something with an error.All over the screen, there’s a black leaf shaped thing connected with black lines. A large part of the lower screen is white, which is sepearated by black lines with the others (the left side of the screen is gray and a small portion where you can see the desktop cursor can be located at the top.) Sounds like the LCD screen is your laptop is cracked. When you have a broken screen the only way to fix it would be installing a new LCD screen.

You’ll have to disassemble the display panel (remove display bezel), unplug the cracked LCD screen from the video cable and inverter and replace it with a new screen. Not difficult but an expensive repair. Krys, Ed I have the same problem with my old laptop but the difference it’s a HP Pavilion Dv9000s. I’ve been trying to decide if I need a new inverter or a blacklight.

I spilled liquid on it and it works perfectly fine on an external monitor. If The spilled liquid went and damaged my motherboard, would my computer even work? The screen comes on but is very dim. Here’s the cheapest way to test the laptop and find out if your problem is related to the inverter/backlight/motherboard. Buy a new inverter. If no help, go to the step 2. Buy a new backlight lamp (link in comment 137).

If no help, most likely it’s the motherboard failure. Liquid spills are very unpredictable. Even a small drop of liquid on the motherboard can fry the entire system. Tom, My daughter spilled tea on her Mac laptop yesterday. I let it dry upside down for a day and removed the battery.

It powers up and it looks like everything is working except the screen is dark. We can make out all the images, but too dark to work on. What is your best guess and what do you think I should do at this point. Did she spill it on the keyboard or display? If she spilled it on the keyboard, most likely the tea wend down to the motherboard and damaged it. Let it dry for some more time. Do not forget to remove the battery.

Who knows, it might start properly in a few days. Thanks Repair Man. I will get a LCD lamp (with a small plug in my case) from ebay to test with per your recommendation. I see some there for $20 with plug. Also, I will test with multimeter, unless you think power is not likely the issue with my description.

Tom, per Repair Man verify if you can plug in an external monitor and get a normal picture. That will confirm if your video card is working. In my case it works fine and the PC seems normal.

I’ve tried an inverter so my next step is to test the backlight. If it works, I’ll buy a new LCD screen for around $120. Thanks again, •. Hey Repairman, I have an HP DV5000, sometimes when I move the screen, either to close it or to adjust it’s position, the screen flickers. It usually only happens if I grab the sides of the screen. I’m not sure what this could be, I tried changing the inverter, but apparently the one I ordered online is the wrong one because the backlight would come on for about a second then the screen would go dark, I put the old one back in and it works fine, but I still have the flickering problem.

Before I go crazy trying to find the correct inverter for this machine, do you have any other suggestions? Dan, I have an HP DV5000, sometimes when I move the screen, either to close it or to adjust it’s position, the screen flickers. It usually only happens if I grab the sides of the screen. I’m not sure what this could be, I tried changing the inverter I don’t think that your problem is related to the inverter board because it flickers only when you move or adjust the display.

With a failed inverter the screen would be black all the time. It sounds more like a connection related issue. Here’s what you can try: 1. Try reconnecting video cable on the back of the LCD screen. Maybe the cable doesn’t make good connection with the screen.

Try replacing the video cable. It’s possible you have a short inside the cable. Could be LCD screen failure. Zigymantas, one thing i want to know – when this “Screen inverter board” works normally, does it rise temperature, cause the part in my laptop under the “HP” logo on screen gets warm, and, of course, it rise tempereture of lower part of the display. There is a backlight lamp mounted inside the LCD screen, it’s on the bottom of the screen. When the backlight lamp is on, it generates heat.

It’s normal when the bottom part of the display panel is warm. It’s getting warm because of working backlight. By the way, the inverter board also generates some heat when it’s on.

Hello, A few days ago, without any warning sign, after almost two years of trouble-free operation, my laptop screen started to flicker until it finally settled to a gray color, with barely visible vertical stripes. I stopped it forcefully (by pressing the power button for a few seconds). After restart the same gray screen appeared right from the beginning. When I left it turned on, the screen gradually changed color to a blue-green shade (resembling the one from Windows 7’s logon screen). Later that day, when I restarted the laptop, all went ok, at least for a while. After some two hours of operation, the flicker happened again and all the symptoms were back. I plugged in my desktop’s monitor and after displaying the Win7 bootscreen it returned a BSOD (nvlddmkm.sys).

Afterward I could get it to work somewhat reliably only in safe mode with networking support. Before any subsequent start of the laptop, I first tryied using its own display. On several occasions it worked normally and for quite a few hours before it freezed. I also started to get some WHEA errors in the Event log (WHEA-Logger EventID 19 Warning A corrected hardware error has occurred, WHEA-Logger EventID 18 Error A fatal hardware error has occurred.) I then tryied uninstalling/reinstalling the drivers for the chipset (nforce 7000M) and video adapter (nVidia 8600M GS), all without any positive result.

I also suspect these problems might be related to heating issues (the video chip is rated at ~70-80 C). I took a look inside the laptop’s display and there were no apparent signs of damage to any of the components. Now, I can use it only connected to the external monitor and only in safe mode. If I try to use the laptop’s own screen, it only displays the vertical gray lines that eventually turn blueish after leaving it on for a couple of minutes. My biggest concern is whether to buy a new Acer screen or a new laptop alltogether.

I thought that by describing these details to you, you might have some clues in order to pin down the issue and make a decision. I’m sorry for this long message. I’d appreciate your help. My specs: Acer Aspire 5520G AMD Turion 64 X2 TL-58, 1900 MHz nVidia nForce 7000M-610M (southbridge), AMD Hammer DDR 2 IMC (northbridge) 2048 MB RAM nVidia GeForce 8600M GS, 512 MB GDDR2 Acer CrystalBrite 15.4″ LCD (LG Philips), WXGA Windows 7 Ultimate 64bit (worked fine for around a month before this whole thing happened) •. I have a problem with a Dell Vostro 1400 laptop.

Recently, upon waking from standby, the bottom 2/3’s of the LCD is covered by close-together horizontal lines. This problem is resolved by a shut down and restart. However, it recurs when the unit goes into standby again.

Easy enough not to allow the machine to go into standby, but concerned this is an early indicator of something worse component wise starting to fail. Did not know if this was an indication of the inverter starting to go, or if the standby problem indicates something more related to the video card or some other problem Any suggestions on where to start/test? Update @comment #148: In the last days I didn’t even bother to try to use the laptop’s display anymore. I struggled with the external monitor, in safe mode. I then observed some vertical blueish lines in a regular pattern (about an inch between each group of lines).

I wanted to test this on another external display. It reproduced. Then I booted an Ubuntu from an USB stick. The line pattern persisted.

I thought that the problem was with the video card. But something happened in this stupid saga. Last night I connected again the desktop monitor to the laptop and booted from an Ubuntu USB stick. It didn’t show the line pattern. Then I bootted from the HDD (Win7) in normal mode (previously, it worked in safe mode only). Again, surprise, it worked.

Then, I disconnected the external display and tryied to use the laptop’s display. It worked again!

Right now, I’m writing this from my laptop, using its display. It behaves like nothing happened in this last week. Well, almost – the same freaking WHEA errors continue to appear (WHEA-Logger EventID 19, 18). I’m expecting a failure anytime. Anyway, it seems I’ll eventually have to buy another laptop (this time it won’t be Acer/AMD/nVidia; I’m trying my luck with an Asus/Intel/Ati). Thanks for bothering with my messages. Hally, My biggest concern is whether to buy a new Acer screen or a new laptop alltogether.

I really doubt that your problem is related to the LCD screen. In your comment you said: – my laptop screen started to flicker until it finally settled to a gray color, with barely visible vertical stripes. – I plugged in my desktop’s monitor and after displaying the Win7 bootscreen it returned a BSOD.

– Afterward I could get it to work somewhat reliably only in safe mode with networking support. – I then tryied uninstalling/reinstalling the drivers for the chipset (nforce 7000M) and video adapter (nVidia 8600M GS), all without any positive result.

This sounds like a problem with the video card. In a case of LCD screen failure, you still should be able to use the laptop with an external monitor with normal resolution, but you can use it only in Safe mode when only basic video driver is loaded. I’m not familiar with your model. If the video card is integrated into the motherboard, you’ll have to replace the whole motherboard. If the video card is a discrete module, you can replace just the video card.

Mike, Recently, upon waking from standby, the bottom 2/3’s of the LCD is covered by close-together horizontal lines. This problem is resolved by a shut down and restart. However, it recurs when the unit goes into standby again.

Did not know if this was an indication of the inverter starting to go, or if the standby problem indicates something more related to the video card or some other problem Any suggestions on where to start/test? First of all, your problem is not related to the inverter board. When the bottom 2/3s’ of the screen fails, you still can see the rest of the screen. That means the inverter powers up the backlight and works properly. Your problem could be related to: 1. Loose connection between the video cable and LCD screen.

You can remove the keyboard bezel and try reconnecting the video cable. Start the laptop while the keyboard bezel is removed. Now carefully move the video cable without moving/touching the screen. Does it affect video on the screen.

If the video changes when you move the video cable, it’s possible that you have a bad cable. Apparently there is short inside the cable. Try replacing the cable. Turn on the laptop and wait until video fails. Can you get it back to normal by moving the screen back and forth? Can you get it back to normal if you torque the screen a little bit?

If yes, most likely you have a faulty LCD screen. You’ll have to replace the screen.

Hally, In the last days I didn’t even bother to try to use the laptop’s display anymore. I struggled with the external monitor, in safe mode. I then observed some vertical blueish lines in a regular pattern (about an inch between each group of lines). I wanted to test this on another external display.

It reproduced. Then I booted an Ubuntu from an USB stick. The line pattern persisted. I thought that the problem was with the video card. I does sound like a problem with the video card.

You said the laptop works fine for now, but most likely it will fail in the future. After you mentioned vertical blueish lines in a regular pattern on the external screen, I’m 99% positive that you have a faulty video card.

Steven, I have a brand new high end Dell laptop funning Vista. I want to use an external 22″ monitor with it. When I plug in the monitor, the screen has a pink tint. I have tried everything but cannot do anything to make this go away. I plugged the monitor into a desktop (running XP) that I have and the screen looks fine. The video works fine on the external monitor, so there is nothing wrong with the laptop or software. You are using different cables for the TV and external monitor, correct?

I think the cable running from the laptop to the 22″ TV could be bad or not plugged correctly. Try reconnecting the cable and if it doesn’t help, try another cable.

Hey, I have an HP Pavillion dv6000 laptop and I had a screw fall out of the back of it and the screw was connected to the monitor. So I was moving the monitor around quite a bit to fix the screw. When I was moving it around the screen went almost completely black. So now I can see very faint images on the screen but they are almost invisible and almost completely black. I was wondering if you think this is the Blacklight lamp or the Inverter Board or possibly something else. My computer is no longer under warranty and it is also my work computer so I am freaking out and want to fix it myself and not tell my boss about the problem.

Any help would be much appreciated!! Have a wonderful night! Nikki, I was moving the monitor around quite a bit to fix the screw. What does it mean?

How can you fix the screw by moving the monitor. It’s not clear. Now I can see very faint images on the screen but they are almost invisible and almost completely black. I was wondering if you think this is the Blacklight lamp or the Inverter Board or possibly something else. I cannot tell what is wrong without looking at the laptop. Could be bad connection between the video cable and inverter.

Reseating the cable connection may help. My Dell Inspiron E1505 laptop has been having a display problem: the screen is dark with barely visible images but it works fine with an external monitor. I commented about it on this site a few weeks ago and determined that my inverter needed replacing. I bought a replacement inverter online (not a genuine Dell part). It didn’t look exactly like the one in the latop, but it fit. Once it was installed, the display worked again. But after about 20 minutes, I noticed the screen looked pinkish: this had happened the first time the display failed.

Then, without warning the screen went black and that was it. It functioned for maybe 1 hour befor ethis happended. The symptoms are the same as the first time: I can faintly see images on the display but the screen is not backlit. Is my laptop burning out inverters for some reason?

Is there a remedy? Could it be because I didn’t use the precise Dell replacement part? Jodi, the screen is dark with barely visible images but it works fine with an external monitor. Most likely it’s either bad inverter or backlight lamp failure. I bought a replacement inverter online (not a genuine Dell part).

It didn’t look exactly like the one in the laptop, but it fit. I would suggest replacing it with the exact replacement part. I cannot tell if your new inverter works properly or not. Once it was installed, the display worked again.

But after about 20 minutes, I noticed the screen looked pinkish: this had happened the first time the display failed. It’s likely that there is nothing wrong with the inverter board. Usually the screen looks pinkish when it has a faulty backlight lamp. When the backlight fails, you have to replace the LCD screen. It’s very hard to replace the backlight lamp inside the screen though possible. Ron, I have an HP ZE5478Cl with the hi res screen. It works sometimes, but will intermittently start flickering, and it looks like a tv with vertical hold problems, white bars flickering.

Is that an inverter? It never goes dark. Works fine with an external monitor too This doesn’t sound like inverter failure. I think it could be: 1. Loose connection between the video cable and LCD screen/motherboard.

Try reseating connections. Bad video cable. Try replacing the cable. Bad LCD screen.

Try replacing the screen. I have a HP DV6244. The screen flickers and dims on the left side only. The right side of the display is bright. The dimming is not black, but more like the display looks when you are running on battery. Fully visible, all the colors, just dimmed. The other half is fine (note that this is half divided vertically from top).

Moving the lid sometimes makes the screen go normal, but this is not repeatable. I sent this machine into HP under warranty 2 yrs ago for same issue, and it was fixed then. It has reoccured. Is this an inverter, cable, or (budget forbid) a backlight/screen? Chip, I sent this machine into HP under warranty 2 yrs ago for same issue, and it was fixed then. Do you remember what did they replaced last time?

The screen flickers and dims on the left side only. The right side of the display is bright.

The dimming is not black, but more like the display looks when you are running on battery. Fully visible, all the colors, just dimmed.

The other half is fine (note that this is half divided vertically from top). Moving the lid sometimes makes the screen go normal, but this is not repeatable. It’s not the inverter or video cable failure. Sounds like a failing backlight lamp inside the LCD screen.

I think you’ll have to replace the screen. Hey, About a week ago my laptop started giving me problems. My screen just went dark and before It went dark it use to have a little flickering. Than recently it just went completely dark, but I noticed that my battery light wasn’t showing up.

If I plug it to ac power the light won’t even show that it’s charging. Before the screen went dark for like a month or two I noticed that if I run the laptop on it’s own battery it would say battery too low when it’s been on charge for like two days. I am confused if it’s just the battery that needs to be replaced for the inverter or backlight.

How can I know for sure cuz my friend tried to use external monitor on it and nothing showed up on the external screen. Also the computer runs fine I can see that windows opened up and if I look close I see something in the background but the battery light won’t show up either. Hope u can help me to figure out if it’s battery or something else. Kit, I think you might have two different problems with the laptop. About a week ago my laptop started giving me problems. My screen just went dark and before It went dark it use to have a little flickering. This description sounds like the inverter or backlight lamp failure.

Also the computer runs fine I can see that windows opened up and if I look close I see something in the background This part of the description also sounds like the inverter or backlight lamp failure. Which one is failing? I don’t know. Most likely the inverter board. I would definitely try replacing the inverter first. If I plug it to ac power the light won’t even show that it’s charging but the battery light won’t show up either Could be bad battery. I think you should fix the backlight problem first and if it works, move to the battery.

I have an HP dv9700z with a display problem. Here are the symptoms. The display remains dark on most boot attempts, but eventually after anywhere beteen 2 and 15 reboot attempts, the screen illuminates and works properly until it is turned off (sometimes for up to 12 hrs).

When it is dark there is no image. No HP startup splash screen. As far as I can see, no dim image in the beam of a flashlight (but it is hard to see with the glossy screen in this computer).

The computer boots normally whether or not the display works. An external display works properly and normally whenever it is connected by either VGA, HDMI, or SVideo connector. When connected to an external display and the internal display is not working, the display driver does not see the internal display (only the external display). When connected to an external display and the internal display is working, the driver sees both displays.

When I close the screen when the display is working, the computer goes to sleep normally, and it restarts when the lid is lifted. If the display was working prior to sleeping the computer, the display always works when the computer wakes from sleeping. Jiggling or jostling the computer does not affect the display. If it is not working, it doesn not blink or start working when bumpedand if it is working, jiggling the computer or moving the display does not cause any changes in behavior (no lines, no blinking, no change in brightness). I removed and reseated the connectors to the inverter, and no improvement. The computer has never had any foreign material (liquid, dirt, etc.) get into its internals.

So I am baffled. What do you think it might be? To me it sounds like it might be an inverter, except for the absence of a dim image in the dark displaybut I may just not know what to be looking for.how dark can the image be? Thanks in advance for your helpand for all the guidance you have provided me through your advice to others. Barry, I have an HP dv9700z with a display problem.

Here are the symptoms. The display remains dark on most boot attempts, but eventually after anywhere between 2 and 15 reboot attempts, the screen illuminates and works properly until it is turned off (sometimes for up to 12 hrs). When it is dark there is no image. No HP startup splash screen.

As far as I can see, no dim image in the beam of a flashlight (but it is hard to see with the glossy screen in this computer). The computer boots normally whether or not the display works. Most likely it’s either bad connection between the video cable and motherboard, or the video cable is bad. The video cable is routed though the left hinge and that’s where the damage may occur.

Remove the hinge cover and take a closer look at the video cable. Do you see any damage. Can you make the internal screen work if you move or touch the video cable? Find out if moving the cable affects video on the internal screen at all. Thanks for the reply, Repair Man.

I have not tried to move the cable directly when the computer is on, but I have moved it indirectly. I have opened and closed the computer cover both during periods when the screen is not working and during periods when it is working. No matter how much I move the screen, it does not cause a non-working screen to work and it does not cause a working screen to stop working. Does that tell you anything?

I am away from home until Friday. I will take the bezel apart then and see what happens when I move the cable directly. I do have one new piece of information. I saw the reference to the person who recommended diagnosing inverter function using a Multi-meter with a frequency readout. If the inverter was working he got a strong, high frequency (30 – 50 kHz) reading when he held the probes in the vicinity of the inverter output.

If the inverter was not working he got a weak or no reading. I did a similar test using an oscilloscope. I found that during periods when the screen was working I got a strong (a few mV) 55kHz signal when I held the O’scope probe near the inverter output. During periods when the inverter was not working, I got not signal.

So it looks like the inverter output is the issue. Doesn’t say if the problem is a bad inverter or a bad cable/connection to the inverter. But it is probably not the LCD itself (do you agree?). What do you think of testing the input voltage to the inverter?

That same person recommends testing between input pin 1 and ground. Shouldn’t that determine if the issue is the inverter or the cable? Thanks again, Barry •. Barry, I have not tried to move the cable directly when the computer is on Try that. If there is a short inside the cable, you should see changes on the laptop screen when you move the cable. I saw the reference to the person who recommended diagnosing inverter function using a Multi-meter with a frequency readout.

If the inverter was working he got a strong, high frequency (30 – 50 kHz) reading when he held the probes in the vicinity of the inverter output. If the inverter was not working he got a weak or no reading. Are you talking about? I tried that (even purchased a new Fluke multimeter ) but it didn’t work for me. By the way, I love my multimeter. I think the inverter board works properly only when it’s loaded by the backligth lamp.

Yes, if the backlight lamp is working fine you can get high frequency readings. But what if the backlight is bad? I think in this case you will not get those high frequency readings even if the inverter is good, because it’s not loaded. I could be wrong though. I did a similar test using an oscilloscope.

I found that during periods when the screen was working I got a strong (a few mV) 55kHz signal when I held the O’scope probe near the inverter output. During periods when the inverter was not working, I got not signal. So it looks like the inverter output is the issue. Or the inverter board is not getting any power from the motherboard and there is no light because of that.

What do you think of testing the input voltage to the inverter? That same person recommends testing between input pin 1 and ground. Shouldn’t that determine if the issue is the inverter or the cable? I think you can safely test voltage on the input. Yes, it’s pin 1 and ground. You should get something like 10-20VDC.

I’ve been fixing laptop for 5 years and here’s what I found. The best way to find out if you have issues with inverter or backlight lamp is testing the laptop with another known good inverter or backlight. I have not tried to move the cable directly when the computer is on, but I have moved it indirectly. I have opened and closed the computer cover both during periods when the screen is not working and during periods when it is working. No matter how much I move the screen, it does not cause a non-working screen to work and it does not cause a working screen to stop working. Does that tell you anything? Could be the motherboard failure.

Maybe one of the components is failing. This component fails most of the time, but if it starts, it works properly until the laptop is turned off. That’s my guess. Hi Repairman. I tried the cable wiggling test with the bezel removed. No effect on the display. I tested the input voltage to the inverter and it was 15 volts DC whether the display was working or not.

The “guide” link you noted in your last response is the test I did to test the inverter output.but I used an oscilloscope instead of a multimeter. The test gave me consistent resultsa stable 55 kHz output when the display was working, and no output when the display was not working. It really looked like it is the inverter. But since then I have replaced the inverter (twice) and there was no change in the symptomsthe display works sometimes and not at other times.

Maybe your hypothesis about the LCD having to “load” the inverter is correct? You speculate that the problem might be a motherboard failure. What part might it be, considering that it always works on an external display.and it always sends the proper 15 VDC signal to the inverter? Finally, I really don’t want to buy a backlight to do that inverter test.

It know that I will wind up breaking the light and producing a hazardous mess from the mercury inside. Considering that I have tested 3 inverters and the symptoms don’t change, I have to believe that the problem is elsewhereand probably the LCD itself. I won’t invest another $300 or so into this computer for a new 17″ display. So for now I will thank you for your suggestions, and continue to limp along with the computer as it is. Thanks, Barry •.

Barry, The “guide” link you noted in your last response is the test I did to test the inverter output.but I used an oscilloscope instead of a multimeter. The test gave me consistent resultsa stable 55 kHz output when the display was working, and no output when the display was not working. It really looked like it is the inverter. But since then I have replaced the inverter (twice) and there was no change in the symptomsthe display works sometimes and not at other times. It’s very unlikely that all inverters are bad.

Most likely there is a problem with the backlight lamp. You speculate that the problem might be a motherboard failure. What part might it be, considering that it always works on an external display.and it always sends the proper 15 VDC signal to the inverter? I don’t think that your problem is related to the motherboard failure because the LCD screen works intermittently.

I would test the laptop with another backlight lamp first. I really don’t want to buy a backlight to do that inverter test. It know that I will wind up breaking the light and producing a hazardous mess from the mercury inside. Considering that I have tested 3 inverters and the symptoms don’t change, I have to believe that the problem is elsewhereand probably the LCD itself. I won’t invest another $300 or so into this computer for a new 17″ display.

Check out LCD screens on eBay. Some brand new LCD screens are very inexpensive.

You can find a new one for about $100. I came to the same conclusion that you did and decided to buy a backlight for testing. As soon as I did that, it seems like the display has healed itself (so far about 6 successful reboots in a row).

Once it starts acting up again, I will get a backlight and test it. If the screen’s backlight is bad, I will try and replace itand if I screw up the screen, I will buy a new screen thru eBay. If the test backlight works consistently, then I will probably do what you suggest and replace the screen with one thru eBay. Thanks for all of your help and guidance. Thank you for a very informative site. I dropped my laptop a few weeks back and I’ve had the dark screen problem ever since. I’ve tried reconnecting the cables for the FL inverter but I don’t have good results.

Display is fine on an external monitor. I just want to know if it is possible to pinpoint the broken hardware (inverter or lamp) by the way it messed up i.e me dropping it. I would also like to know how compatible inverters are.

The one i’ve got is j9084 1.00 Toshiba satellite. Thank you again mate. I have a Toshiba A135 S2266 laptop. The powers light on the computer itself comes on and the fan starts up just fine but the screen stay blank both internally and externally and the light on the cd drives is amber instead of green. The cd drive will not open when the eject button is pressed, it only open when i put a pin in the little hole on the side. Could this be a problem with the motherboard, memory or inverter.

I have opened it and double check all the wires and the MB, they look fine and have no burnt scent. Please help me, i’m in dire need. JahJah, I have a Toshiba A135 S2266 laptop. The powers light on the computer itself comes on and the fan starts up just fine but the screen stay blank both internally and externally First of all, I would check laptop memory (RAM). Most likely you have two memory modules installed and it’s possible that one of the modules failed. Try removing memory modules one by one and test the laptop with each RAM module separately in each slot.

And the light on the cd drives is amber instead of green I believe when the drive is working the light is always amber, it never turns green. Remove the DVD drive and turn on the laptop.

Maybe the DVD drive is bad and shorting the whole system somehow. Just a guess. C, Can someone help me with my laptop problem?

I’m wondering if this is a graphics card problem or a screen inverter board problem. On the side left of my laptop screen and sometimes on the left half of the bottom screen, there’s a pink glow/splash/tint. It’s gotten longer over the past week.

Most likely this is not related to the graphics card failure. A failed video card would affect image on the entire screen, not just a part of the screen. Just in case test your laptop with video on the external monitor. If the external video works perfectly and there is no pink glow/splash/tint, the problem is not related to the graphics card. I think it’s either failing backlight lamp inside the LCD screen (more likely) or failing inverter board (less likely). From my experience, when the inverter board fails, the backlight lamp stops working completely. In your case only one part of the screen is affected, so I assume this is the backlight lamp failure.

Bill, Hi-I have a HP DV6000. The screen has a pink/red tint from the moment I turn it on, even before Windows loads. Do you think the backlight or the inverter or LCD screen is causing this problem? I reseated the display connector on the motherboard but that didnt fix the problem You’ll have to test your laptop with an external monitor. If the same problem appear on both internal and external screen, your problem is related to the video card failure. If red tint appears only on the laptop screen and external video works perfectly, most likely this is the backlight lamp failure. The lamp is mounted inside the LCD screen and very hard to replace.

It means you’ll have to replace the entire LCD screen. Hi Repairman, today I had removed the RAM but the problem wasn’t rectified, so I took out the Inverter and replace it with another one from a different model Toshiba laptop and the screen lights up just perfect but I didn’t leave it hooked up long enough to observe the cd drive cause of the fear of ruining that one. I also did the procedure vice versa and it was indeed a bad inverter cause the known good laptop screen stayed blank. My inverter has 7 pins and the other one has 6 hence the reason that I had removed it quickly. Senaville, i have lenovo y410, the problem is with the lcd display, after it on then the dispaly start to vibrate vertically.

Sometimes, the image which should at the top but it can be view at bottom of lcd display. Nope, it’s not related to the inverter board, that’s for sure. I already tested to hooked it up to an external LCD and the screen on the external monitor is just fine. That means the video card is working properly. I think it’s either failing LCD screen (more likely) or problem with the video cable (less likely). I would try replacing the LCD screen first. I got a odd problem, got a dell vostro 1710 and the screen got sat on.

Got the replacement screen and had issues with the frame so had to swap with old frame to get holes to line up. Now when it boots I do not see the bios screen but the black screen lights up some.

But when I get in windows and see my desktop 50% of the time I see it OK, I do have it hooked to an external monitor so I know the computer is AOK. Do you think my inverter is bad or the new screen? Have you had to replace the frame of a lcd, maybe I got something messed up there? Any help would be great.

I have an Acer Aspire 5610Z Laptop which has been damaged by lightning. Up to now I have not been able to find someone who can definitely say what is damaged. When the lightning struck there was a flash from where the adapter connects to the laptop and the machine went off only to immediatly power on again, it then continued working fine for a while. When I returned to the laptop later it had switched off and would not restart. I have tried various recommendations, for instance remove the battery for 30 sec., connect to an external monitor and lastly to replace the Inverter. None of these efforts produced positive results. There is no sound or anything remotely visible on my laptop now.

Could or would you be able to give me some idea as to what may have been damaged and if it would be worth repairing. Thank you for your advice. Elizabeth Barnard, I have an Acer Aspire 5610Z Laptop which has been damaged by lightning.

Up to now I have not been able to find someone who can definitely say what is damaged. When the lightning struck there was a flash from where the adapter connects to the laptop and the machine went off only to immediatly power on again, it then continued working fine for a while. When I returned to the laptop later it had switched off and would not restart. I have tried various recommendations, for instance remove the battery for 30 sec., connect to an external monitor and lastly to replace the Inverter. None of these efforts produced positive results. There is no sound or anything remotely visible on my laptop now.

Was the AC adapter plugged when the lightning struck? Maybe the lightning damaged the AC adapter. After that the laptop worked until the battery got discharged. Now you cannot turn it on because the battery has no charge and AC adapter is dead.

I would test the AC adapter first. If the lightning struck when the AC adapter was unplugged and now the laptop is dead, probably it damaged the motherboard. Can you start the laptop just from AC adapter when the battery is removed? Can you see any LED lights on the front when AC adapter is plugged in? Yes the Adapter was plugged in – I was using the laptop, and yes my husband checked the adapter. I cannot start the machine at all; with or without the battery removed and just the adapter. When I removed the battery the first time it powered up and the screen showed briefly, but then it went dead again.

I did see the power and battery lights come on once or twice but now these also don’t light up any more. The person who changed the Inverter for me experienced the same thing at the time that I was. Unfortunately he is unexperienced and perhaps did nor insert the converter correctly. Elizabeth Barnard, I cannot start the machine at all; with or without the battery removed and just the adapter. When I removed the battery the first time it powered up and the screen showed briefly, but then it went dead again. I did see the power and battery lights come on once or twice but now these also don’t light up any more. This is not inverter related problem.

You still should be able to start the laptop when inverter fails but the image on the screen will be very dark. In your case the laptop will not turn on at all and there are no LED lights. Assuming that your AC adapter is good, I’m almost positive you have bad motherboard. I have a Dell Inspiron 1545. The screen cracked so I replaced it.

The new screen was very dim. I tried the old screen again and it was also dim.

It works fine on an external monitor. I went to a computer repair place, told them I thought it was the inverter, and they took it in for a free diagnostic. They tested my parts on another machine and tried using parts that worked in other machines on my machine (screen, inverter, cables). That didn’t work so now they say they think it is the motherboard and I am supposed to call them for a price quote on that.

If everything works fine through an external monitor should I still replace the motherboard or are they simply missing something? What else could it possibly be? Brad, I went to a computer repair place, told them I thought it was the inverter, and they took it in for a free diagnostic. They tested my parts on another machine and tried using parts that worked in other machines on my machine (screen, inverter, cables).

That didn’t work so now they say they think it is the motherboard and I am supposed to call them for a price quote on that. If everything works fine through an external monitor should I still replace the motherboard or are they simply missing something? If your parts worked on another laptop and parts from another working laptop didn’t work in your machine, most likely there is a problem with the motherboard. By the way, check the lid close switch. I don’t know off the top of my head if the lid close switch in your laptop is magnetic or regular button, but that could be the problem. It’s possible that the lid close switch got stuck in the “closed” position and the laptop “thinks” that the display is closed even when it’s open. If the lid close switch is a regular button, try tapping on the switch, hopefully it will work.

Did you purchase a compatible replacement screen? Maybe the screen wasn’t compatible and you fried the motherboard when installed it into the laptop. Just in case. I’m not sure if it’s going to help but try it anyway. Boot your laptop with an external monitor.

Go to the device manager and delete (uninstall) the display adapters and monitors. Restart the laptop and test again. I actually mentioned the possibility of that button/sensor being stuck and the guy just said “I’m sure the technician checked it.” I ordered the wrong screen at first but didn’t try to install it since I could tell they weren’t compatible but now I’m sure I have the right one.

I’d try the display adapter uninstall but the repair place still has my laptop. I’ll suggest that they try that though.

I hope that replacing the motherboard works. If not I’m out quite a few bucks and still left with a mystery machine. Hi, I am using the HP Pavillion dv2842se laptop from past 2 years. I never face any problem till now.

Two days back I shutdown the laptop normally after my work. After 2 hours I tried to start the laptop but the power button and HP quickplay buttons are not working. So I tried to start the laptop with HP quick play remote. From remote it is starting but my screen is black. I noticed that if I look at my screen from an angle with an external light, I can see the icons and everything. What may be the problem.

Thanks, Kiran •. KiranKumar, What happens when you press on the power button? Can you hear any noise coming from the laptop? Also, when the AC adapter is plugged. Can you see any LED lights on the laptop indicating that the laptop is getting power? The faint image on the laptop screen could be related to the inverter/backlight lamp failure but I don’t think this is the only problem with the laptop.

You said the power button stopped working and it’s not related to the inverter/backlight failure. If both the power button and screen backlight failed at the same time, there could be a problem with the motherboard. Hi Repair Man, Repair Man: What happens when you press on the power button? Can you hear any noise coming from the laptop? Also, when the AC adapter is plugged. Can you see any LED lights on the laptop indicating that the laptop is getting power? KiranKumar: When I press power button no noise and nothing is happing.

And AC Adapter plugged I see the power charging LED lights on laptop. Repair Man: If both the power button and screen backlight failed at the same time, there could be a problem with the motherboard. KiranKumar: If problem with the mother board, is possible to start laptop.

Because, when I use the quickplay remote to start laptop, it is starting and all the LED lights are glowing(Power and quickplay) and problem is screen backlight. Thanks, KiranKumar •. KiranKumar, If problem with the mother board, is possible to start laptop. Because, when I use the quickplay remote to start laptop, it is starting and all the LED lights are glowing(Power and quickplay) and problem is screen backlight. The backlight problem could be related to the inverter board failure. You can try replacing the inverter. But I don’t know why your laptop not starting when you press on the power button.

Could be bad power button board, bad cable, bad connection, etc I cannot tell without looking inside the laptop. Repair Man, I got my laptop back from the shop and did the last ditch thing you said below before I sent it off to Dell. You said to “Just in case.

I’m not sure if it’s going to help but try it anyway. Boot your laptop with an external monitor. Go to the device manager and delete (uninstall) the display adapters and monitors.

Restart the laptop and test again.” And now it doesn’t display anywhere, not dimly on the screen nor on an external monitor. Is there anyway to “undo” that uninstall without access to a screen? Brad, And now it doesn’t display anywhere, not dimly on the screen nor on an external monitor. Is there anyway to “undo” that uninstall without access to a screen? This is not normal. If all hardware operates properly, uninstalling the display adapter and monitors will not do any damage.

I’ve done it many times myself on many different laptops. The laptop should start properly, detect all missing (uninstalled) hardware and reinstall drivers automatically.

Apparently, hardware in your laptop do not operate properly. Here’s what you can try. Turn off the laptop, unplug the AC adapter and disconnect the battery. Wait for a few minutes, connect the adapter and try turning it on again. Repair Man, My HP Pavilion dv9700 has the very common blank screen problem. I’ve been using an external monitor and it works great.

I removed the bezel to check the inverter connections and that didn’t seem to help. However, after I assembled the inverter and opened my monitor I saw a window saying that a new monitor was found (but still no image on my laptop). Altough I haven’t tried a new inverter I think there is a possibility that the monitor-motherborad cable may be the problem. What parts of my laptop I need to open to check if the problem is the cable? Thanks in advance! Andrew Hall, I have an Acer Aspire 9520 where the inverter had completely fried i.e.

Black and charred. I have replaced this with a new one however the screen only comes on for approx 0.5 seconds. I have tried another screen and it does exactly the same. It would seem that there is not enough power from/to the inverter although I’m no expert.

What would be the next step in diagnosing this problem. The laptop does work perfectly using an external screen. It’s hard to tell. It’s possible you purchased a defective inverter.

If you still experiencing the same problem after replacing the inverter board and LCD screen (I assume both parts are good), most likely the failure is related to the LCD cable or motherboard. You cannot tell with one is causing the problem without replacing them with known good parts. Maybe the LCD cable is bad and it fried the first inverter? This is just a guess. Kyle, My HP Pavilion dv9700 has the very common blank screen problem.

I’ve been using an external monitor and it works great. If the laptop works fine with an external monitor, most likely the video card and motherboard work properly. I removed the bezel to check the inverter connections and that didn’t seem to help. However, after I assembled the inverter and opened my monitor I saw a window saying that a new monitor was found (but still no image on my laptop). Altough I haven’t tried a new inverter I think there is a possibility that the monitor-motherborad cable may be the problem. Can you see a very faint image of the desktop on the screen when the laptop is on?

If not, this failure is not related to the inverter board. You can try reconnecting the LCD cable on both ends – on the motherboard and back of the LCD screen. Maybe this is connection related issue and reconnecting the cable will fix it. What parts of my laptop I need to open to check if the problem is the cable? It’s necessary to take apart the display panel and access the back side of the LCD screen.

Another end of the LCD cable is connected to the motherboard. This connection is located under the keyboard cover, close to the left hinge. Anil, I am having a toshiba satellite laptop.

The invertor was getting too hot below the screen. One fine day the screen went black.

I ordered a new screen invertor and replaced the old one. It works and still gets hot. Now after a week the screen again went black again.What could be the reason for the invertor getting hot. Wrong type of the inverter installed. The inverter is defective. Could be bad connection between the inverter board and LCD cable.

Not sure about this one, but it’s possible that the backlight lamp is not working properly and drawing too much power from the inverter. First of all, make sure you are using the right inverter for this laptop.

Gauntlett, MY laptop works fine on battery but as soon as I plug the power cord it goes dark. Could this be a problem with the inverter board. Test your laptop with an external monitor. Can you get video on the external screen?

If not, check the memory modules. Maybe memory modules are not seated correctly. If external monitor works fine but there is no video on the internal screen, check connection between the video cable and motherboard, LCD screen.

It’s possible the video cable is not making good contact. Reconnecting the cable might help. Dease, I took my HP Pavilion Laptop apart and put it back together. Everything works but the Screen. Screen does not light up or show any image. Test your laptop with an external monitor.

Can you get video on the external monitor? If yes, check connection between the LCD cable and motherboard. Maybe the cable is not plugged correctly. If there is no video on both the internal and external screens, check memory modules. There is a chance that one of the memory modules (or both of them) not seated correctly. Try reconnecting memory. I have a Toshiba Satellite M55-S135.

I found information that led me to believe I was having a problem with my backlight inverter. On startup the picture would flicker for a few seconds then go out. I ordered a backlight inverter for my laptop and it did not illuminate the screen. The old one did but continued to go out. I got another one and installed it.

The backlight now seems to illuminate the screen but no images come up. I can here the computer starting up and the sound of the windows screen sounds but nothing shows up on screen. Now when I tried reinstalling the old inverter it does the same thing as the new one.

Any suggestions? I have a HP nc6400. The LCD screen is very bright and does not flicker – basically I can see everything fine – but – the colors seem to be inversed. Its as if it were a negative image of the monitor. I checked all the setting in the Accessibility Options, I checked the video controller settings and even reinstalled the correct video drivers, and set the BIOS to all factory default settings.

It’s DEFINITELY a hardware issue and not a software issue. I hooked it up to an external monitor and it works great – I took the LCD case apart and made sure all the connections were in tact. Still – nothing fixed. Would also like to note that even at startup – before windows loads – the HP splash screen is also the wrong colors and the BIOS screen is the wrong colors. Based on what I have read here I would not think its the inverter. Someone correct me if you think I am wrong.

Could it just be the LCD needs replaced? I received the laptop for free when these symptoms started occurring. The guy who I got it from said it fell of his bed, while closed, about a foot from the ground and this has been happening since. I don’t want to buy a new screen if it could possible be something on the mother board, graphics card, or possibly the inverter. Anyone have any suggestions or ideas? I’m trying to save a bundle on shipping by not having to send a very slightly wrong Toshiba laptop screen back. I ordered a replacement for a dropped and cracked Toshiba Tecra a8 PTA83c LCD, without taking it apart first.

After the part arrived I took the bezel apart and found the screen fit each of the mounting screws and video cable, but the inverter connection cable ends are not compatible. The broken one is a Samsung LTN154x3, the replacement I was shipped is an LGPhillips LP154wx4. Am I going to screw something up if I clip the old and splice it onto the new?

Do the different shaped pins mean that much? Any assistance would be helpful, as the shipping there and back will be as much as I paid for the screen to begin with! It using the model of the machine (Toshiba Tecra a8 PTA83c), and the actual screen inside was a Samsung. The The, but will it work if I take the old connector and put it on the new wires how fussy are backlight •. Bernie, After the part arrived I took the bezel apart and found the screen fit each of the mounting screws and video cable, but the inverter connection cable ends are not compatible. The broken one is a Samsung LTN154×3, the replacement I was shipped is an LGPhillips LP154wx4.

Am I going to screw something up if I clip the old and splice it onto the new? Do the different shaped pins mean that much? I believe this is just a different connector type, but the backlight lamp should be the same. Replacing the existing connector with a new one shouldn’t affect functionality of the backlight lamp.

New backlight lamps are sold without any connectors, so it’s up to you which connector to use. If you do everything correctly, the LCD screen should work properly with a new connector. D Bowman, I have a HP nc6400. The LCD screen is very bright and does not flicker – basically I can see everything fine – but – the colors seem to be inversed. Its as if it were a negative image of the monitor. I checked all the setting in the Accessibility Options, I checked the video controller settings and even reinstalled the correct video drivers, and set the BIOS to all factory default settings. It’s DEFINITELY a hardware issue and not a software issue You are correct, this is not a software related problem.

I believe this is the LCD screen related failure and I’ve seen it happening before. Most likely replacing the LCD screen will fix the problem.

Based on what I have read here I would not think its the inverter. Yep, it’s not the inverter. The screen still has light, so the backlight lamp and inverter board works properly. The guy who I got it from said it fell of his bed, while closed, about a foot from the ground and this has been happening since.

Apparently he damaged the LCD screen. Could it just be the LCD needs replaced?

I’m 95% positive that replacing the LCD screen will fix the problem. Just in case, try reconnecting the LCD cable on both ends – on the motherboard and back side of the LCD screen. There is a chance of loose connection but I don’t think so. Again, try reconnecting the LCD cable before buying a new screen and if it doesn’t help, replace the screen. Omarey, I have a Toshiba Satellite M55-S135. I found information that led me to believe I was having a problem with my backlight inverter. On startup the picture would flicker for a few seconds then go out.

I ordered a backlight inverter for my laptop and it did not illuminate the screen. The old one did but continued to go out. I got another one and installed it. The backlight now seems to illuminate the screen but no images come up. I can here the computer starting up and the sound of the windows screen sounds but nothing shows up on screen. Now when I tried reinstalling the old inverter it does the same thing as the new one It’s possible that while replacing the inverter board you accidentally pulled the LCD cable and disconnected it from the LCD screen or motherboard. Try reconnecting the LCD cable on the back of the LCD screen and on the motherboard.

It might help. I have an ACER 5520, and it has developed symptoms as you describe — the backlight flashes on for a moment if I force it by toggling the laptop “external/internal screen” button, but its main state is so dim that it looks black unless you look very very closely and you can then see the pixels are actually there. However, it seems like only the right half of the screen lights up, all or most of the time. Does this mean that the lamp is gone? Can I replace that myself? I have already ordered the inverter board.

Any hints would be appreciated! Further to my last post, I opened up the bezel to check the inverter connection, and peer in to see if I could see the CCFL’s. I put it back together without issues. A few hours of use later, while using it on an external monitor, it just stopped dead.

Powering it on causes it to turn on for about 2 seconds, power off, then reboot itself a few seconds later, continuously until I pull the battery. Any advice appreciated! This is the new priority unfortunately. Does this mean that the lamp is gone? Can I replace that myself? I have already ordered the inverter board.

Cory, I have an ACER 5520, and it has developed symptoms as you describe — the backlight flashes on for a moment if I force it by toggling the laptop “external/internal screen” button, but its main state is so dim that it looks black unless you look very very closely and you can then see the pixels are actually there. However, it seems like only the right half of the screen lights up, all or most of the time.

Does this mean that the lamp is gone? Can I replace that myself?

I have already ordered the inverter board. It’s hard to tell which one is causing the problem without testing the laptop. Could be bad backlight lamp or faulty inverter board. I guess you’ll have to wait for the inverter board and try replacing it first.

Cory, I put it back together without issues. A few hours of use later, while using it on an external monitor, it just stopped dead. Powering it on causes it to turn on for about 2 seconds, power off, then reboot itself a few seconds later, continuously until I pull the battery.

Any advice appreciated! This is the new priority unfortunately.

That’s strange! I doubt that your second problem is related to the inverter board. It’s possible you have two separate issues.

Maybe memory is bad? Try removing memory modules one at a time. Test your laptop with each memory module separately. If one of the modules is bad, the laptop will start properly when the bad module is removed. Hey Repairman, Thanks for the quick reply.

I tested the laptop with each SIMM, and with no SIMMS, and also with no hard disk. Behaviour was the same. One interesting thing that I did not note before, is, when first turned on the fan comes off, then shuts off with the notebook. But when it then enters its try-try-again power-off-power-on loop, the fan does not come on. Do you think I have shorted something in the LCD/inverter setup? Or have I just got really bad luck and everything is failing all together? Cory, I have a secondary power supply that goes with me for occasional use, and its adjustable.

I’ve just found that the last time I used this adapter, was just as the original screen problem popped up. I’ve found that the switch had migrated to 24V instead of 19V. Is there any chance my problems are contained to? One part that I could replace? If you used 24V instead of 19V, it’s possible that you damaged the motherboard. I cannot tell if that’s the case without looking at the laptop.

In one of the previous comments you wrote: Powering it on causes it to turn on for about 2 seconds, power off, then reboot itself a few seconds later, continuously until I pull the battery. This sounds like the motherboard failure but I could be wrong. Hi Repair Man, Similar problem to what I have read so far. Just got a Toshiba Netbook NB305, and it took a lot of pressure to the top cover.

Basically, it got sat on while it had some stuff on the cover (keys, pocket knife, etc.). It looks like the “point load” exerted itself on the little board that’s taped to the back of the LCD screen. The LCD screen itself doesn’t look traumatized.

So here’s the problem: At first, when powered up, the screen locked “washed out”; quite bright, but no contrast. I thought “uh oh, big problems”. So while the unit was powered up, I gave the screen a bit of a “twist”; basically held both top corners and gave it a bit of torsion, but nothing outlandish.

The screen responded by flashing “normal” colors a couple of times, but now, the colors look like they are “inverted” with a little loss of brightness to boot. And “twisting” the screen no longer has any effect. I took it apart and powered it up, and the back side of the screen looks quite bright, it looks like the backlight is workng fine.

I can even navigate on the screen, but the colours look reversed. Question: did my LCD sereen bite it (even though it shows no sign of “cracks” etc.), or is it the little board attached to the back of the screen the has a toasted chip because of being squished by that point load? Any tips would be very helpful, cheers. Hi Repair Man, Just an update from my last post.

I downloaded the “Powerstrip” utility and it seems to be able to compensate for about 90% of my screen’s problems. I inverted the gamma, and most of the colours now display correctly but it seems with altered saturation, and a hint of “blurriness”. The “blurriness” does not manifest itsself as poor contrast or washed out colour, or poor brightness, but rather perhaps where there is shading, it is slightly the wrong colour so the display appears a little “off”. Also, there are faint horizontal bars (about six to eight) scrolling up the screen at lower brightness levels.

The “bars” look like the bars when an a CRT screen is videoed. The bars fade out to almost imperceptible when the brightness is set to max, but then the colours are bit off. Soon as the brightness is turned down a bit, the colours look better, but the bars return a bit, but this seems to be the best “comprimise setting” to make the screen usuable. So my question: Do I need to replace the screen itself?

Or the circuit board taped to the back of the screen (or is this board part of the screen)? Or is it the inverter board (which I’m not sure is damaged because the weight did not get exerted on the “hinge” part of the computer.

I can also post some pics if it helps. Thanks in advance. Hello, I tried to install windows xp professional on my HP CQ35. I made my first bootable device as cd rom and the second as HDD.

The system boots from the cd and shows that setup is loading the files. And immediately after that a blue screen pops up and says a message. I’m not able to move further. The message states something like this setup could not continue if this is the first time.chect for viruses on ur computerrun chkdsk-f.and so on.

So please help me out in solving out this issue.How can I install windows.Is it possible. I am waiting for ur reply.

Thanks a lot in advance. Senaville, I tried to install windows xp professional on my HP CQ35. I made my first bootable device as cd rom and the second as HDD. The system boots from the cd and shows that setup is loading the files. And immediately after that a blue screen pops up and says a message.

I’m not able to move further. The message states something like this setup could not continue if this is the first time.chect for viruses on ur computerrun chkdsk-f.and so on. So please help me out in solving out this issue. Could be bad hard drive or memory. This is an HP laptop and most likely it has the hard drive test utility in the BIOS menu. Turn on the laptop, enter the BIOS setup menu and find the hard drive diagnostics utility. Run this utility.

If the hard drive fails test, you’ll have to replace it with a new one. Some HP laptops also have memory diagnostic utility in the BIOS menu.

Alternatively, you can use Memtest86+. If memory fails test, replace it. HP dv6000 GETTING FOUR SMALL SCREEN, PLEASE HELP I have a HP dv6000 laptop, every time a turn it on I get four small screens about 4″x5″ each. This happens as soon as the BIOS screen appears and it stays like that even after windows loads up. Right now it is basically useless since the fonts are too small to be read.

I have checked almost all the post on this page and does not look like an inverter problem. Do I have to change the screen? But again all I know is what I have read on this great site. Any help would be greatly appreciated. I updated video driver and did not help •. Hey, I have a Compaq Presario V6000. The screen has gone black although at an angle can still see the desktop, also external monitor works fine.

I was suspecting the inverter so replaced the inverter but still have the same problem however I am concerned that maybe the replacement inverter is faulty also. When the laptop powers up there is a buzzing noise and flashes (sometimes also burning smell) from bottom right of LCD like the backlight is trying to come on but fails. Is my problem likely to be the backlight bulb itself rather than the inverter? Hi, Great website! I dropped my Sony Vaio and cracked the screen. I took it in to diagnose how bad the damage was and they said that everything was fine except for the screen. I ordered a screen and installed it and it is still black.

The screen is black but I can see two faint large black vertical bars and can also see the windows logo in the background–just shades of dark black. When hooked up to an external screen it works fine. What is the most likely next thing to replace–the inverter, video cable or something else??? It was dropped very hard •.

Hello there, First of all thanks a lot for this useful site! I have a Sony Vaio VGN-FZ31J Laptop and had just the problem described here (display went dim, sometimes bright then dim again). I exchanged the inverter for one from an older Vaio Laptop (model: PCG-K215B) that I had. NOW: the backlight is working constantly but is much much dimmer.

Sometimes it becomes brighter (as bright as it should be) for a second but then becomes dim again. ALSO: I cannot control the brightness anymore, not by using the Fn/F6 keys, neither by going into the battery/brightness settings. That is: I can increase or decrese the brightness settings but it has no effect whatsoever. Is the inverter not up to the task of running with my newer vaio model?

But why does it work sometimes then? Please tell me what I should do. Ann Banos, I dropped my Sony Vaio and cracked the screen. I took it in to diagnose how bad the damage was and they said that everything was fine except for the screen. I ordered a screen and installed it and it is still black.

The screen is black but I can see two faint large black vertical bars and can also see the windows logo in the background–just shades of dark black. When hooked up to an external screen it works fine. What is the most likely next thing to replace–the inverter, video cable or somet 1. Make sure the video cable is seated correctly.

Reconnect cable connections on the LCD screen, inverter, motherboard. Did backligth work on the cracked screen?

Maybe the new screen is defective? Try replacing the inverter board.

Hi there Reapair Man, thanks a lot for your answer. I will probably do what you have suggested but: I have now observed that my screens brightness goes to normal whenever I lift up my laptop, then it goes dimmer after a few seconds and when I put it on the table and lift it up again the same thing happens. My question is: is that even possible (a normal bright backlight and screen) with a wrong inverter that doesn’t supply the right voltage? For an inverter I would have to pay about 30 Euros, which is not all that much, but I don’t wanna buy one and still have the same problem. Also how do I know which inverter I have to buy and where can I get it from. Are all the inverters for the Vaio FZ series suitable?

Thanks in advance. Fredinand, I have now observed that my screens brightness goes to normal whenever I lift up my laptop, then it goes dimmer after a few seconds and when I put it on the table and lift it up again the same thing happens. My question is: is that even possible (a normal bright backlight and screen) with a wrong inverter that doesn’t supply the right voltage? So, the screen brightness goes to normal whenever you move the laptop, correct? Maybe one of the ends on the video cable is not making good contact with the LCD or inverter? Try reconnecting the cable.

Make sure all connectors are seated correctly. Pito, i have a HP DV4 1225 dx, and the screen has been flickering now for 3 weeks now. In the first week it would flicker for 4 to 10 minutes and now when ever i switch on the laptop its flickers all the time.

I bought a new external monitor and it works fine. My friend says that its the LCD inverter that has a problem. How it flickers? The backlight turns on and off, but the image stays on the screen? If yes, it’s most likely either bad inverter or baclkilight lamp failure.

Try replacing the inverter board first. If it doesn’t help, replace the LCD screen. Pier, Even with the hinge broken my laptop was working fine up until last saturday.Suddenly while it was on the display went blank and it never came back.now once im switching on the laptop the display goes first blank with vertical colour lines then it looks its trying to display the image but it keeps showing blank/white shade. The video cable is running close to the left hinge.

Maybe the video cable was damaged by the broken hinge? Do you think this might be related to the inverter?or something else? Your screen is still bright and you can see the lines, it means the backlight/inverter work properly. Nope, this failure is not related to the inverter.

Again, this could be the video cable failure. Test your laptop with video on an external monitor?

Can you get image on the external screen? Steve P, Is there any functional difference in Inverter boards. As per say the voltage and watts. Yes, all inverters are different.

I hope to replace my 14.1 XGA matte screen with one for the same manufacturer just a different number LT141X6-122 with a LT141X7-122) They are identical screens just the plug on the inverter wires are different. Could I just change out the plug and have it work?

I cannot tell. You’ll have to try.

I’ve done it successfully before but as I said all inverters are different. How about this: I have a Dell Inspiron 1000 and the display went black on me about a week ago. I opened the screen bezel to get a part number (I assumed it was a dead bulb) and when I put everything back together and powered it up to use an external display with it, the display came on – but it was all multicolored static/snow. I just fired it up again to try and repeat the effect, and the display came on fine, but by the time it got to Windows, pixels that should have been white, in some places were pink, and the pink hue was starting to “bleed” into adjacent pixels. Bad inverter?

Linda Solt, I have a SONY VGN-AR320E 17.1 Glossy screen and the problem is that the screen goes out seconds after turning on the laptop. I sounds like the inverter because after reading some of your comments, an external monitor can be used and if you take a flashlight aim it at the screen from the corner you can see everything. Is it difficult to replace the inverter yourself? Could be bad inverter OR bad baclight lamp inside the screen.

First, I would try replacing the inverter board. If it doesn’t help, try replacing the LCD screen.

It should be relatively easy but I don’t know your technical skills. You’ll have to remove the screen bezel. The inverter should be located somewhere below the LCD screen. Bill S., How about this: I have a Dell Inspiron 1000 and the display went black on me about a week ago. I opened the screen bezel to get a part number (I assumed it was a dead bulb) and when I put everything back together and powered it up to use an external display with it, the display came on – but it was all multicolored static/snow. I just fired it up again to try and repeat the effect, and the display came on fine, but by the time it got to Windows, pixels that should have been white, in some places were pink, and the pink hue was starting to “bleed” into adjacent pixels.

Bad inverter? Nope, doesn’t sound like inverter. A bad inverter board cannot cause multicolored static snow. Most likely it’s either bad video cable or LCD screen failure. Here’s what you can try. Carefully move the video cable (without touching the screen) while the laptop is turned on. Will it affect image on the screen at all?

If image changes when you move the cable, most likely the cable is bad. If image not affected and you get just garbled image, probably you have bad screen. I assume the laptop works fine with an external monitor, right? If external video is garbled too, this is video card failure. I have a Toshiba P105-S6227 laptop and the screen developed several pronounced vertical bars. I purchased a used screen from a Dell laptop which had identical specs and connector on rear. Since installing the new screen (using the original inverter and cable as the Dell inverter has a different connector) the screen works perfectly but seems to be stuck at about 60% brightness.

The laptop indicates brightness changes from 0% to 100% in the power options and Toshiba toolbar (which I tried disabling with no affect) but the visible screen brightness does not change. Could the inverter be the cause? Brightness was fine with the old screen •. WOW, I don’t think I’ve EVER seen such an awesomely informative site as this one! Thank you so much!

My question involves intermittent video problems with my HP Pavilion dv1000 laptop. After reading all your answers, I’m still not quite sure whether my problem is A.) the failing inverter or backlight issue (since I can see words and pictures very faintly when the screen goes dark) or B.) just a loose connection or C.) damage in the hinge area (because it only happens from time to time and can sometimes be fixed by moving the screen back and forth or wiggling the screen). So, can any of these be ruled out? Or could all of these be possiblities?

In any case, I guess I should start by checking all connections and wiring. But I am not exactly sure where and what to check. Do you have any suggestions or info for me, or should I just proceed to download the manual for my model and plunge ahead? Thanks in advance for anything you can provide. Michael Ecker, I have a Toshiba P105-S6227 laptop and the screen developed several pronounced vertical bars. I purchased a used screen from a Dell laptop which had identical specs and connector on rear. Since installing the new screen (using the original inverter and cable as the Dell inverter has a different connector) the screen works perfectly but seems to be stuck at about 60% brightness.

The laptop indicates brightness changes from 0% to 100% in the power options and Toshiba toolbar (which I tried disabling with no affect) but the visible screen brightness does not change. Could the inverter be the cause? Brightness was fine with the old screen Are you sure the new screen is identical? It’s possible the new screen is not compatible.

Maybe the backlight lamp inside the screen is not compatible with inverter board. I’ve replaced many screens on Toshiba laptops but I never had a problem like that. On the other hand, finding the right screen for a Dell laptop could be challenging. If you install a wrong screen into a Dell laptop the brightness doesn’t work properly. I think you just got a wrong screen. Marcia, My question involves intermittent video problems with my HP Pavilion dv1000 laptop. After reading all your answers, I’m still not quite sure whether my problem is A.) the failing inverter or backlight issue (since I can see words and pictures very faintly when the screen goes dark) or B.) just a loose connection or C.) damage in the hinge area (because it only happens from time to time and can sometimes be fixed by moving the screen back and forth or wiggling the screen).

It’s hard to tell what is wrong. If moving the display panel temporarily fixing the problem, it could be just loose connection somewhere inside the display panel. I would try reconnecting the video cable on the motherboard and back of the LCD screen first. You can disassemble the display panel and try moving the video cable while the laptop is turned on. If moving the cable affects image on the screen, it’s possible you have a bad cable.

I have a Dell e1505 that I just replaced the inverter on. On boot up the screen lights up just fine, initial windows loading pages are lit, but once I hit the welcome screen, the screen goes dark with the faint images of the user logins. If I boot into safe mode – the screen works fine. If I uninstall the ATI x1400 video card drivers – the screen works find, but at a lower resolution.

Question: Could this be a faulty inverter? Does the inverter process commands from a video card to determine the brightness of the screen? Is this a sign the inverter is not functioning properly?

Thank you – awesome site here. Saxum, I have a Dell e1505 that I just replaced the inverter on. On boot up the screen lights up just fine, initial windows loading pages are lit, but once I hit the welcome screen, the screen goes dark with the faint images of the user logins. If I boot into safe mode – the screen works fine.

If I uninstall the ATI x1400 video card drivers – the screen works find, but at a lower resolution. Question: Could this be a faulty inverter? Does the inverter process commands from a video card to determine the brightness of the screen? Is this a sign the inverter is not functioning properly? Weird problem!

I’m not sure what’s going on here. Can you boot the laptop in normal mode and before it hits the welcome screen, reduce the screen brightness via keyboard shortcut? Will it stay on in normal mode with reduced brightness?

Repair Man, The screen will no longer respond to the brightness commands / key board short cuts. The slider will appear, and I can adjust to max and min brightness with no change. I installed some generic ATI drivers and was able to get the video card to work at the screens native resolution and full brightness. However, the laptop screen will not respond to any brightness commands – a minor annoyance.

I’ll take a full bright screen to a dark one any day! I am guessing the inverter is responsible for adjusting screen brightness by varying the amount of voltage to the backlight?

Or I might have two problems that arrived at the same time – faulty inverter and a faulty graphics card. However, the Dell gives no option for replacing the card without soldering skills (I am told). Thanks for the help. Saxum, I installed some generic ATI drivers and was able to get the video card to work at the screens native resolution and full brightness.

However, the laptop screen will not respond to any brightness commands – a minor annoyance. I’ll take a full bright screen to a dark one any day! I am guessing the inverter is responsible for adjusting screen brightness by varying the amount of voltage to the backlight? Could be software problem.

What if you enter the BIOS setup menu and try using the brightness shortcut in BIOS? Can you change screen brightness when the laptop booted to the BIOS menu? MevaD, Panasonic CF-W4. Typical inverter fault – dim screen. Replaced with inverter from a CF-T1. Screen lights up fine but display has lots of rapidly moving lines on it.

Tried inverter from a CF-W2, same result. Does the inverter have to be the exact same one that failed, or do I have a different problem? I think you have two different problems. By replacing the inverter board you fixed the backlight problem and now you have another one. First of all, test your laptop with an external monitor. Find our if external image also has same problem. If image on the external monitor is fine, most likely you have one of the following: 1.

Loose connection between the video cable and motherboard/LCD screen. Try reconnecting the cable first.

Bad video cable. Bad LCD screen. If all screens in your laptops are compatible, you can use a known good screen from one laptop to test another laptop.

Lining on a prayer, I have an all in one Vaio desktop. When I turn it on the screen is black. But when I press the monitor button, the screen shows up perfect but only for 4 seconds. Computer otherwise runs fine. Can download programs, have a DVD movie run etc.

I just can’t see the screen unless I repeatedly hit the monitor button. Like to repair it myself if it is an inverter, that is if I can figure out how to open the Vaio case. A massive feat on its own. Question: Does this look like an inverter problem? It’s possible. Can you see a very faint image on the screen when the PC is turned on?

If yes, probably it’s either bad inverter board or backlight lamp failure. Unfortunately I cannot help you with the disassembly instructions because I’m not working on PCs like that.

MK, My laptop (Presario CQ40) screen flickering with several lines & its sometimes shifted up & down a few times too. What is the main cause? First of all, test your laptop with an external monitor. If external video works fine, your problem is inside the display panel.

It could be bad connection between the video cable and motherboard or LCD screen, bad video cable or failing LCD screen. Try reconnecting the video cable on both ends. This might help. Try moving the video cable while the laptop is turned on. If moving the cable affects image on the screen, probably it’s bad cable. Try replacing the cable. If reconnecting the cable doesn’t help and moving the cable doesn’t affect image on the screen at all, probably you have a problem with the LCD screen.

Replace the screen with a new one. Hello, I have an odd backlight issue on my Lenovo Y550P.

The symptoms are that the screen flickers occasionally usually once per few hours. And more important after few hours of normal work the brightness control stops working.

Windows does not seem to be getting status of the brightness level at that time as it shows irrelevant level at power management tool. This happens with either drivers from Windows or Lenovo. When laptop goes to sleep mode or is shut down the backlight stays on with all the other components off.

It looks like a fault of the inverter control chip to me. Can you please let me know what you think on this? Regards, Alexey •. Adrian, I have an HP Pavilion dv7 3079 wm that will start for about a second and shut off. I have got the front screen bezel off but there isn’t an inverter there!? Where the heck is it located.

Apparently you have an LED backligt screen installed in our HP Pavilion dv7 notebook. A LED screen doesn’t require an inverter board. By the way, some Pavilion dv7 notebooks come with a regular LCD screen. If that’s the case, the inverter mounted below the screen. Why did you take apart the display panel. It doesn’t sound like a problem with the screen at all. Did you have a chance to test your AC adapter?

It’s possible the AC adapter failed and the battery doesn’t have enough charge to start the laptop. Test your AC adapter first. Vic monaghan, i have a hi grade m760s.replaced dc jack and when turned on i have no light on screen.tested backlight and it works.swopped inverters and no difference.cant think what it can be.display works fine on external monitor I’m not familiar with this laptop model but doesn’t it have a lid close switch button? Usually it’s located somewhere close to the left or right hinge. It’s a small button which activates sleep/hibernate mode when the display is closed. It’s possible the lid close switch button is stuck inside the case. Try tapping on the lid close when the laptop is turned on.

It might help to release the switch and fix the backlight problem. Alexey, I have an odd backlight issue on my Lenovo Y550P. The symptoms are that the screen flickers occasionally usually once per few hours. And more important after few hours of normal work the brightness control stops working. Windows does not seem to be getting status of the brightness level at that time as it shows irrelevant level at power management tool.

This happens with either drivers from Windows or Lenovo. When laptop goes to sleep mode or is shut down the backlight stays on with all the other components off. It looks like a fault of the inverter control chip to me. Can you please let me know what you think on this? Enter the BIOS setup menu and test screen brightness control buttons in there. If it fails even in BIOS, it’s definitely not driver/OS relates problem (I think it’s hardware related).

I agree with you. Possible this is inverter related failure. It’s possible that after a few hours the inverter gets too hot and fails. What if you run your laptop with reduced brightness? Will it fail? Hi there, I am Sreeraj from India.

I am seeing something strange in my HP dv6- 1245DX. I bought that an year ago from US. Now, for the last couple days it is showing few bright (high bright) areas near the bottom panel; starts near the plastic panel and spreads up to an inch in diameter. Looks like a fungal patch.

There are no issues to other parts of the screen. I was wondering whether this could be a issue with the inverter! Is this a typical symptom relating to LCD inverter? Also, typically how much it will cost to replace inverter and the LCD panel for my model?

Hello, I did what you advised and the brightness indeed cannot be controlled from BIOS which confirms this is the hardware issue. However when LENOVO person was testing my laptop during a whole day using a new disk snapshot it was functioning well all through the day. They even left an intensive NVidea test for the whole night and nothing happened with the backlight control. What additional factor do you thnk can lead to the failure? Another fact is that the brightness control always recoveres in about an hour after failure to fail again in some time. To the run with reduced brightness – I normally run it at 20-30% level and it fails. I can see a whole group of people complaining to this kind of issue on lenovo forum but they still cannot recognize a root cause: Thank you for your replies.

I really appreciate your help on this matter. ——————– Enter the BIOS setup menu and test screen brightness control buttons in there. If it fails even in BIOS, it’s definitely not driver/OS relates problem (I think it’s hardware related). I agree with you. Possible this is inverter related failure. It’s possible that after a few hours the inverter gets too hot and fails. What if you run your laptop with reduced brightness?

Will it fail? Sreeraj, I am seeing something strange in my HP dv6- 1245DX. I bought that an year ago from US.

Now, for the last couple days it is showing few bright (high bright) areas near the bottom panel; starts near the plastic panel and spreads up to an inch in diameter. Looks like a fungal patch. There are no issues to other parts of the screen. I was wondering whether this could be a issue with the inverter! I don’t think this problem is related to the inverter board. The screen backlight still works, so the inverter operates properly.

It sounds more like LCD screen (maybe backlight lamp) related failure. Is this a typical symptom relating to LCD inverter? When inverter fails, the whole screen goes very dark. A faulty inverter board cannot cause any image distortion on the screen. Also, typically how much it will cost to replace inverter and the LCD panel for my model? Depends on the shop.

Also, it’s possible to replace the screen at home. Alexey, I have reproduced the backlight issue using different hard drive and OS snapshot so the problem with hardware is confirmed.

That’s what I thought. I’m pretty sure this is hardware related failure. Can the Wifi or sound devices sit on the same bus and therefore affect and overload the backlight components? I don’t think so. By the way, I just googled your laptop model and it looks like you have LED backligth screen! Do you know if you have a LED screen inside?

It means there is no inverter board. The screen brightness controlled by the motherboard. Is there any newer BIOS available for downloads? It’s possible Lenovo fixed this issue with the BIOS update.

If not, most likely it’s either faulty screen or motherboard issue. I cannot tell without testing the laptop with a known good screen.

Strange case of laptop display running fine up to maximum brightness, but only on battery power. Clues: 1) Laptop runs perfect on battery only, up to max brightness settings (set via the bios and FN key control). 2) Perfect on AC power only if display is set at 50% brightness (on AC). 4) New AC chargers (2 tried), same problem. Does MB regulate AC adapter voltage before sending it on to the inverter, or does the inverter manage everything? This is a 2007 Dell Inspiron 1720 on Vista.

I have a strange problem I think my be the inverter. My screen will randomly go haywire with all kinds of strange colors (usually florescent green and purple) and distortionbut if I close the lid, even partially, for just a second it stops. Would this be the inverter? I can’t seem to find anything on the internet that sounds like this. I have an Acer Aspire 6930 and have tried to get the bezel off but can’t for the life of me figure out how to get the bottom snapped apart where the inverter is. Any suggestions for either problem would be appreciated! Cindy, I have a strange problem I think my be the inverter.

My screen will randomly go haywire with all kinds of strange colors (usually florescent green and purple) and distortionbut if I close the lid, even partially, for just a second it stops. Would this be the inverter? Nope, this doesn’t sound like inverter related problem. When the image go haywire, the screen is still bright, right? It means the inverter works properly. Most likely it’s either bad video cable or LCD screen failure. I would try reconnecting the video cable on both ends.

Just to make sure it’s not connection related problem. Try replacing the video cable. Try replacing the LCD screen. The backlight failed on my HP dv6910us (dv6700 family) and so I replaced the inverter board and powered it back up on the battery and the screen bcame back just fine. After about 20 minutes I plugged in the power adapter as the battery was getting discharged and the inverter board failed instantly. I replaced the board a second time and again powered up the laptop on the battery and the screen was fine again. I powered it down and plugged in the power adapter and tried turning it on and the inverter immediately failed again.

I can see that the computer is working fine by brightly illuminating the screen externally and can shut it down normally. Do you think the power adapter may be generating a spike which is causing the inverter to fail or might the lamp be going south and need to be replaced? The backlight brightness looked normal when powered up on the battery and the brightness controls worked. Hello, After reading your site I believe I am having an inverter issue, but I wanted to check in to make sure i’m correct. I have a Dell XPS M1530, and my screen has begun to dim on the left side.

It seems like it’s basically right down the middle, with everything to the left getting dimmer. When I turned on the laptop after a weekend of being shut down, the screen looked perfectly fine for about 10 minutes, then slowly began to darken again on the left side. Also, when I unplugged the laptop and it switched over to battery, I noticed a high pitched, buzzing sound.

After a few seconds, the entire screen went blackbut I could still barely make out an image of my desktop. I had to reset the computer and plug it back in to see anything. What do you think, is this symptomatic of the inverter going bad? Thank you very much for your time, Roger •. Hello, I have a strange problem with my friends laptop. (Fujitsu Siemens Amilo La1703).

When I switch on the laptop, the screen goes up, and then the brightness is gone, I think it is an inverter problem. But when I hold the laptop with my hand on the left corner, the brightness is come back. So I opened the case, and when I touched the motherboard next to the GPU, the brightness comes back, till when I held my finger on the board, when I released, 2 second later the brightness gone.

What do you think? It is an inverter problem? I tested the laptop with an external monitor, everything was ok. Thanks for your answer Gabor •. P.Gabor, I have a strange problem with my friends laptop.

(Fujitsu Siemens Amilo La1703). When I switch on the laptop, the screen goes up, and then the brightness is gone, I think it is an inverter problem. But when I hold the laptop with my hand on the left corner, the brightness is come back. So I opened the case, and when I touched the motherboard next to the GPU, the brightness comes back, till when I held my finger on the board, when I released, 2 second later the brightness gone. What do you think? It is an inverter problem?

I don’t think this is inverter related problem. There is a chance of bad connection between the video cable and motherboard (of video card). Try reconnecting the cable first. If it doesn’t help, I think this is motherboard related problem.

Most likely there is a micro crack somewhere on the motherboard. When you apply some pressure on the motherboard or hold the laptop on the left corner, you flex the motherboard and make it work for a while. Also, make sure all wires are routed correctly and there is no loose screes inside. Maybe something is shorting the motherboard. Roger, I have a Dell XPS M1530, and my screen has begun to dim on the left side. It seems like it’s basically right down the middle, with everything to the left getting dimmer. When I turned on the laptop after a weekend of being shut down, the screen looked perfectly fine for about 10 minutes, then slowly began to darken again on the left side.

Also, when I unplugged the laptop and it switched over to battery, I noticed a high pitched, buzzing sound. After a few seconds, the entire screen went blackbut I could still barely make out an image of my desktop. I had to reset the computer and plug it back in to see anything.

What do you think, is this symptomatic of the inverter going bad? It’s hard to tell without testing the laptop with a known good inverter or backlight lamp. This could be either failing inverter board (maybe not providing enough power) or failing backlight lamp. Really cannot tell without testing.

If you have to guess, try replacing the inverter board first. It’s relatively easy to replace and shouldn’t be expensive. Ken, My HP Pavillion dv9000 works fine except every time I boot it up it shows black and purple spots on the display screen. Typically they are at the top and bottom of my screen and they are different shapes and sizes.

What can I do? Test your laptop with an external monitor. If external image works fine and has no black and purple spots, I think you might have a problem with the LCD screen. Just in case, you can try reconnecting video cable on both ends to make sure it’s not connection related failure. If reconnecting the cable doesn’t help, I guess you’ll have to replace the LCD screen. If same spots appear on the external monitor, try reinstalling the video driver. John, The backlight failed on my HP dv6910us (dv6700 family) and so I replaced the inverter board and powered it back up on the battery and the screen bcame back just fine.

After about 20 minutes I plugged in the power adapter as the battery was getting discharged and the inverter board failed instantly. I replaced the board a second time and again powered up the laptop on the battery and the screen was fine again. I powered it down and plugged in the power adapter and tried turning it on and the inverter immediately failed again. I can see that the computer is working fine by brightly illuminating the screen externally and can shut it down normally. Do you think the power adapter may be generating a spike which is causing the inverter to fail or might the lamp be going south and need to be replaced?

The backlight brightness looked normal when powered up on the battery and the brightness controls worked. It’s hard to tell what is causing this failure. There is a chance the problem somehow related to the backlight lamp.

Maybe the backlight lamp can handle lower brightness (when laptop runs on the battery) but fails as soon as you plug the AC adapter (when screen brightness goes up). What if you lower LCD screen brightness settings for AC mode? Will the screen stay on this way? Daniel smith, I have a gateway modelmx3416.

The screen boots up for a seconds and then goes dark with faint images on screen. I am thinking of trying an inverter Could be bad inverter or backlight lamp failure. If you have to guess, try replacing the inverter board first. When I hook up to a monitor the monitor also works for a few seconds and then goes to sleep.

It’s possible the external video goes to sleep because the video signal goes to the laptop screen. Can you switch to the external monitor using a keyboard shortcut? Something like Fn key plus one of the Fx keys? If still nothing, it’s necessary to disconnect video cable from the motherboard and test with an external monitor again. If external video still doesn’t work even with video cable unplugged, this could be motherboard failure. Caleb, I have an Inspiron 640m.

When it boots the Dell logo will flicker on briefly, then the screen goes black. The LCD is still working as you can see the picture under a lamp. The VGA out works also. I tried putting in a different inverter, but the new one doesn’t even flicker the Dell logo. It looks a little different but is supposed to be compatible. Could the bulb be at fault?

It’s very likely that your problem related to the backlight lamp failure. The backlight lamp mounted inside the screen and very hard to replace. Basically, if the lamp fails you have to replace the whole LCD screen. You can search for a replacementDell Inspiron 640m screen on ebay. You have to be careful when replacing screen on a Dell laptop.

Dell laptops are very picky and if you install a wrong screen, the brigness will not work properly. The screen will light up but will not be as bright as before. The inverter board has to match the screen in order to work correctly. Instead of replacing just the scree, you can replace the whole display assemlby which includes the LCD screen, inverter, cable, plastic covers, etc Or search for a new replacement screen which comes with the inverter board.

In this case the brightness should work properly. Shawna, we have a problem with our HP Pavilion PV2500.

Turned it on the other day and the video was sideways, and then went black. Can hook it up via s-video cable to an external monitor with no troubles. Randomly the screen started working again yesterday, but today it is black again – completely black. Does this sound like the inverter or lcd screen? Or should I be looking at motherboard issues? Did you mean HP Pavilion DV2500? If the screen is completely black AND blank (there is no dim image), this could be video cable related failure.

Maybe loose connection between the video cable and motherboard. I would try reconnecting the cable connection first, it’s located under the keyboard. I have a gateway laptop with a a screen that goes dark after turning on. I could still see the faint images in the background. I replaced the inverter. Still no help.

I have a magnetic hibernation lid switch and the magnet fell out when I took the bezel off. In locating the switch with the magnet I noticed the screen came on for a good while. Then it went off. Using the magnet I can get it to come on for 5-20 second periods. Could the switch be bad and could this keep me from getting a picture on an external video screen? Thanks very much for your help. Being a novice, I love reading the questions and answers.

Thanks and have a great day. Nick, I have an ASUS laptop and when I plug in to AC power the laptop screen goes black with a very dim image. I am able to use s-video and plug into a external monitor. When I unplug the AC power cable the image returns entirely on the laptop monitor. Hard to tell what is wrong but here’s my guess. This could be either bad inverter or backlight lamp. It’s possible the screen works fine when the laptop running on battery power because you have lower LCD screen brightness settings for the battery mode.

When the laptop runs in battery mode, the screen backlight doesn’t take much power from the inverter and the screen stays on. As soon as you plug the AC adapter, the laptop goes into A/C mode and the backlight/inverter cannot handle it. Because of that the backlight turns off. This is just a guess.

Here’s what you can try. Start your laptop without AC, finds LCD screen brightness settings and lower screen brigntness for AC mode. Now start your laptop with AC adapter. Does the screen stay on this way? Mike, I have a gateway laptop with a a screen that goes dark after turning on. I could still see the faint images in the background. I replaced the inverter.

Still no help. I have a magnetic hibernation lid switch and the magnet fell out when I took the bezel off. In locating the switch with the magnet I noticed the screen came on for a good while. Then it went off. Using the magnet I can get it to come on for 5-20 second periods.

Could the switch be bad and could this keep me from getting a picture on an external video screen? Most likely this is backlight lamp failure, which has same symptoms as inverter failure (screen goes very dark but still has very faint image). I don’t think you have a problem with the magnetic switch, it’s not a very common failure. Some laptops can switch to the external monitor only after Windows OS completely loaded.

You can try switching to the external monitor using a keyboards shortcut. It’s the Fn key and one of the F* keys.

Hello, I bought two used dell D620 laptops for the kids school work. Nice old laptops except for the weak displays. One still had warranty and I was able to replace it with a new bright one, and the other still has the weak screen. I was wondering if replacing either, or both the inverter and the back-light could restore the brightness back into it and hopefully avoid having to spend near $200 for a new display. I did read many of the blogs here and couldn’t find one with my exact issue, but haven’t read them all, so I apologize if I’m repeating a question that you may have already answered. We sure do appreciate your time and support. My HP DV5 laptop symptoms are a little different.

When I first turn it on I have to slowly raise the lid several times until the screen comes on. If I go past a certain point then the picture goes away. So I start out using the screen with the lid not open very far.

Then after a couple of minutes I can open it further. I continue to creep it open over the course of several minutes while I am surfing until it is fairly usable but not as far open as would be most comfortable. If I go past a certain point it will turn off and I will have to shut it and open it up again but I can get to the same point immediately and not have to creep it open again.

When I say the picture goes off I mean the back light is not on but you can see the picture very faintly. What do you think the cause is? Amir, I was wondering if replacing either, or both the inverter and the back-light could restore the brightness back into it and hopefully avoid having to spend near $200 for a new display.

I cannot tell what is wrong without seeing the screen. Probably it’s just the backlight lamp is getting old and is not as bright as new. Replacing the backlight lamp is not an easy procedure. If you have a problem with the backlight lamp, I would suggest replacing the whole screen. Make sure to find the right screen. In Dell laptops the inverter board must match the screen. If it doesn’t match, the brightness will not work properly.

When I have to replace the screen in a Dell laptop, I usually buy it with the inverter attached to make the inverter matches the backlight. Frustrated, My HP DV5 laptop symptoms are a little different. When I first turn it on I have to slowly raise the lid several times until the screen comes on. If I go past a certain point then the picture goes away.

So I start out using the screen with the lid not open very far. Then after a couple of minutes I can open it further. I continue to creep it open over the course of several minutes while I am surfing until it is fairly usable but not as far open as would be most comfortable. If I go past a certain point it will turn off and I will have to shut it and open it up again but I can get to the same point immediately and not have to creep it open again. When I say the picture goes off I mean the back light is not on but you can see the picture very faintly. What do you think the cause is?

Could be bad connection between the video cable and motherboard or LCD screen. Firs I would try reseating the video cable on both ends and test the laptop again. Also, it’s possible you have a pinched wire inside the video harness. If that’s the case, you’ll have to replace the video cable. Leonardo, I do not have video, except for a brief moment when “Windows” starts and I get a white screen. Could be a inverter problem?

I don’t think this is inverter related failure. You still can see the screen (even though it’s white), it means the inverter works properly. Can you test your laptop with an external monitor? Can you get video on the external monitor? When laptop screen goes white, it means there is no data signal coming from the motherboard.

This could be bad connection between the video cable and LCD screen. Try reseating video cable connector on the back of the screen.

Hi, I smashed my old screen for my dell vostro 1700 (17″) a long time ago, and replaced it with a 15.4 inch out of another dead laptop, worked fine, except the brightness, its dull and when you turn it up or down just is random to how bright it goes. I have tried to change it for a 17inch screen I received, the back-light comes on, but still the problem of brightness everywhere but no picture. I blamed the screen, and ordered another one, same problem. But the 15inch still works fine. I noticed on the inverter 2 points where it screwed to the original screen which seem to have a plate for to conduct electricity. Could this be why I’m getting no picture?

Or am I unlucky and have two dead screens? Scottie, worked fine, except the brightness, its dull and when you turn it up or down just is random to how bright it goes.

The screen brightness didn’t work properly because the inverter board didn’t match the LCD screen. I’ve noticed same problem with many different Dell laptop.

Now, when I have to replace the screen, I make sure to buy one which has inverter attached. In this case it should work properly. I have tried to change it for a 17inch screen I received, the back-light comes on, but still the problem of brightness everywhere but no picture. I blamed the screen, and ordered another one, same problem. But the 15inch still works fine. Maybe 17″ screens you are getting either bad or not compatible.

If you want to install a compatible screen, search by the part number from the original 17″ screen. The 15″ screen still showing the image, it means the laptop operates properly. I guess new 17″ screens have different native resolution from the original screen and because of that do not work properly. This is just a guess. Hi there, I have a pretty tough issue. I have a Gateway W350I T-6836u.

It was originally working fine. And then, I poped the whole thing up just to clean up and improve heat dissipations and stuff. Then I put the whole thing back into shape And I realize I broke the LCD Cable.

And then I bought a LCD cable, but it still doesn’t work! I bought the cable from a reputable dealer, and I’m not sure if it’s the cable or the motherboard. Display is fine, I mean I can connect an external display. But when I plug the LCD cable and the “ring” structure into the motherboard, it doesn’t Boot! I’m waiting for my new invertor but hey, do you have any suggestions of how to fix this problem? Thank you so much so much! Sincerely, •. Byron Sharp How Brands Grow Pdf Creator.

Hi, Great site. I have a Compaq 8510p. The screen will appear ok and then slowly deteriorate into black. If I tweak the top left corner of the screen the picture will come back. As soon as I let go the picture deteriorates again.

I took it apart and checked all of the connections and everything is connected properly. I have read about the inverter but want to make sure it is an inverter problem before purchasing one. I found some videos on YouTube with other people having the same problem. Here is one of the videos. Stan Huang, Display is fine, I mean I can connect an external display.

But when I plug the LCD cable and the “ring” structure into the motherboard, it doesn’t Boot! I’m waiting for my new invertor but hey, do you have any suggestions of how to fix this problem?

This doesn’t sound like inverter related problem. Take a look inside the video cable connector on the motherboard. Maybe you accidentally damaged pins inside the connector. Are you sure the new cable is 100% compatible with the laptop? Could be wrong video cable. I’m working on a toshiba m35x-s3111, as with most m35x models I did a repair on the D/C plug (replaced) next what I thought was an inverter board problem has got me taking more asprin, the screen is very dim, external monitor will not work (tired 3)FN F5, I put a new inverter in and have the same problem.

I unpluged the video cable from the motherboard and get nothing on the external monitor. With no inverter board installed I still get the same very dim monitor.

One other thing I just got the motherboard back from a repair shop in Miami, been working with them for years with no problems, I guess I just need a second opinion or a kick in the &*^(. I’ve ordered a new backlight, can you think of anything I might have missed.??? Hydrod, I’m working on a toshiba m35x-s3111, as with most m35x models I did a repair on the D/C plug (replaced) next what I thought was an inverter board problem has got me taking more asprin, the screen is very dim, external monitor will not work (tired 3)FN F5, I put a new inverter in and have the same problem.

I unpluged the video cable from the motherboard and get nothing on the external monitor. With no inverter board installed I still get the same very dim monitor. One other thing I just got the motherboard back from a repair shop in Miami, been working with them for years with no problems, I guess I just need a second opinion or a kick in the &*^(. Did you check the lid close switch button?

Maybe the switch suck inside the housing and the laptop “thinks” the display is closes even when it’s open. Try tapping on the switch, maybe you can release it. Got the new backlight in today, hooked it up and it won’t turn on. I played with the lid switch button till I’ve got a dent in my finger, that didn’t work! I even hooked up the old inverter and got nothing at all.

With the (so called) new inverter I get a very dim screen, Can a bad inverter, even when it is suppose to be new not let the backlight turn on? I’ll order another inverter but if it don’t work, there is a very big river near here (Mississippi) that just might have another Tobisha for lunch. Stan Huang, Display is fine, I mean I can connect an external display. But when I plug the LCD cable and the “ring” structure into the motherboard, it doesn’t Boot! I’m waiting for my new invertor but hey, do you have any suggestions of how to fix this problem?

This doesn’t sound like inverter related problem. Take a look inside the video cable connector on the motherboard. Maybe you accidentally damaged pins inside the connector.

Are you sure the new cable is 100% compatible with the laptop? Could be wrong video cable. ————— Hey, I got a new motherboard. I also now have 3 cables they all fit fine. I don’t want to get a 4th one. I believe at least one of them is working Do you know anything about the “ring” structure on gateway’s screen connector? I saw the downside of mobo and it’s just nothing.

Is it maybe just something to keep the connect rigid? Also on the ring thing, it used to have some metal but it has been scratched away. Because I remove/replaced so many times Also, I bought a new motherboard for another $60Goodness this repair is taking toooooo much money input! And then I did see the BACKLIGHTS work before the “GATEWAY” Logo comes out so another inverter is on its way.

I’ve also tried to use my ThinkPad to light up the screen when Gateway has displays and it worked flawlessly So. 3 cables2 boards.2 inverter (probably both defective) and 3 displaying screens (1 broke) Anything else I should try? Thank you very much good sir!!! I also used a newly fixed HP for some tests. I put the HP’s inverter on Gateway backlight dims I put the Gateway’s inverter on HP. HP dims and then the LCD cable place started extreme overheat!

So I replaced them back to where it came from and then HP works fine. Very strange. I also had a newly fixed HP Pavilion (video chip stuff) so I think I should share a little bit.

I discovered that. I actually soldered with a hair dryer and a lot of aluminum foils and a soda can. I wrapped all the hp mobo around except a 1×1 centimeter square. And then I heated with hairdryer. I really wasn’t sure what temperature did I reach.

But I tried to flash it without melting that chip. And then after it cooled down I used the ARCTIC SILVER 5 thermal stuff and used Penny Fix. So then that family HP has been working fine since then Before fix it was broke “suffocation” fixed it to work but it works with sub-90 degrees celcius.

And now it works with sub-50 degrees. I hope the solder will work fine with this temp thenPart of the success is by watching your blog, so Thank You! Ok so one night my backlight stopped working so naturally i assume the inverter is to blame and order a replacement. After replacing the inverter success the screen lights up again the problem now is after around 5 mins the inverter makes a high pitched sound and generates alot of heat followed by the screen loosing the light off the left side of the screen if left long enough before shutting down the backlight turns off completely i am inclined to believe the new inverter is faulty any ideas on the cause? Note: using the old inverter the back light dose NOT work at all. Please if you wouldn’t mind help me say where my own problem lies. Similar problems with black screen, as a matter of fact, i am typing this with the back-light off, though i can slightly see what i am typing as the background of this page is white, otherwise i would barely see anything else.

Precisely, my laptop is showing signs both for LCD lamp failure, and Inverter failure. But here are my observations: 1) when i close and reopen the lid, it sometimes lightens up but only for some time. 2) If it tilt the lid backwards, more than about 110 degrees, it blacks out again 3) sometimes it blacks out by itself 4) When i slide my hand phone over the hinge (that is bottom of the screen, and on the power button’s panel), or let me say, over the inverter’s position, it lightens up again. With this can i say it’s inverter failure?

And how much will it take me to fix it. I use Hp Compaq, Presario C700. Hi, my ACER Aspire 7720G Laptop shows “black” Screen after Power on – Win-OS is booting but Screen remains black.When connecting the Laptop to a LCD via external VGA connector then i can see the Boot-Screen but not able to read what is displayed because the ASCII-Characters are scattered and blinking. After Boot-up the Windows Logon-Screen is clearly visible on the 2nd LCD connected via external VGA. What is the Problem?

Do i have two deffective Parts i.e. VGA-Board + Inverter Board or something else? Thank’s allot for help & Brgds •. My screen symtoms are a little different. The laptop had Vista loaded, screen was fine, except that the dimmer didn’t work, it just did nothing when you dimmed, and after a few presses, it turned the light off.

I came back on when you pressed brighten. I have wiped Vista, and loaded XP Pro. Now, the backlight goes off, when you run on battery, and comes back on, when you plug in the charger.

Weird that a change of windows should affect it. Also, the cmos setup works ok on battery, but the backlight goes out when windows runs. Plug in the charger, and all is ok, nice and bright. Heather, I have a hp pavilion dv9000, when it is switched on the monitor goes all blurry, if I push the screen back it changes colour,I then push down the bottom where the hinges are, the hinge on the left as you look at the screen seems to put it normal. Do you think the cables are loose on the inventer board? The screen doesn’t go black. I don’t think this is inverter related problem.

Most likely this is one of the following: 1. Bad connection between the video cable and motherboard. This connector located under the keyboard cover close to the left hinge. Try reconnecting the cable first. If reconnecting the cable doesn’t help, probably the cable itself is bad.

I’ve seem video cables going bad on DV9000 series. Try replacing the cable. Bjarne, Replaced my LCD screen on my Dell Inspiron 6000 wich had cracked. Works fine, but the screen is very bright and cannot be controlled with the Fn+ up or down keys as normal. Screen resolution is the same. Had to reshape the bezel and cut some plastic from the end of the inverter board to make it fit as the new cable to the backlight lamp was to short. It’s possible the new screen is very bright because the old inverter board doesn’t match the backlight lamp.

In Dell laptops the inverter must match the LCD screen. Otherwise the backlight will not work properly.

When you buy a new screen for your Dell laptop you have to make sure the screen is designed for Dell and it comes with the inverter board attached. Cortes, my laptop sony vaio model pcg fx-805 the screen is totaly black out but i can stil see the display i think its inverter board but i can’t find the exact inverter model that compatible with my laptop, i hope you can help me I would suggest removing the inverter and searching for the part number. Usually the part number or model number printed somewhere on the inverter board. After that you can google the part/model number or search on eBay. Searching by the part/model number is the best way to find a compatible inverter. Hi repair man, I have a Sony vaio ar31s which has of a 2 days ago has lost the ability to display the color black. Anything that was black is now green!

I’ve connected to different monitors and have not been able to extend or duplicate my display on either of them. I can however using the hdmi port onto my flat screen TV.

I don’t think its the inverter as the display works but just shows black as green. I’m more drawn towards the Lcd cable or laptop monitor. Is the only way to test lcd cable is to replace it?

Would you concur that it is more likely the cable or the monitor? Many thanks •. I bought a new screen on Ebay and installed it with out any difficulty.

However on starting it up the windows XP screen appears as normal and it seem like it is going to load the system. However after approx 25-30 secs it disappears and a bright, greyish white, screen slowly appears with a pattern of faded dots in the background and a few coloured vertical lines running down it. Would anybody please have the remotest idea as to what the problem would be? I have linked it to an external monitor and everything works fine. If it’s not the screen, what else could it be? The graphics card? Your advice and help would be greatly appreciated.

@ Patrick, I bought a new screen on Ebay and installed it with out any difficulty. However on starting it up the windows XP screen appears as normal and it seem like it is going to load the system. However after approx 25-30 secs it disappears and a bright, greyish white, screen slowly appears with a pattern of faded dots in the background and a few coloured vertical lines running down it. Test your laptop with an external monitor. Do you see the same problem with external video or it’s working fine? If external video works fine and the problem appears only on the laptop screen, it’s possible you got a defective LCD screen.

If same problem appears on the external video, most likely this it graphics card failure. @ yasser, i replace my notebook LCD with a new one then whats happening is when i close the screen the screen still working i check the power option and its ok i isntalled a new windows and the problem still I think I know what happened. Most likely your laptop has a magnetic lid close switch – a small magnet located under the screen bezel activates the switch located somewhere on the motherboard.

I think when you removed the old screen, you accidentally pulled the magnet from its place. Now you have a new screen but there is no magnet.

That’s why when you close the display, nothing happens. Take a look at the old screen, find the magnet and place it back into the proper place (somewhere under the screen bezel). @ Mike Mann, I have a Acer Extensa 4630z and the bottom 1/4 inch of LCD flickers like a wave moving up and down when tested on a external monitor it shows no sign of problems.

This LT have some liquid spilled on it(not sure where)and I’m wondering if this problem could be the inverter or power switch board. This is not inverter failure, that’s for sure. This sounds like LCD screen failure. I don’t think this is related to liquid spill although possible. Also keyboard in not working but the rest of the LT appears to work fine. Probably that’s where the liquid damage is. Have you tested the laptop with an external USB keyboard?

Is everything working fine? If yes, try replacing the laptop keyboard.

@ Paul, I have a hp dv 2000. Sometimes the screen will come on sometimes it won’t. When it does not it will not even post. When it does not post it will not go to external monitor either. Could this be an inverter? No, this doesn’t sound like inverter failure.

When inverter fails, you only lose screen backlight. Everything should work just fine. Have replaced the ram checked connections on mb. Tried another battery. It’s so weird because when i plug power in it works 4 out of 5 times. Any guess to what the problem is. Do you have any problem with internal wireless card or sound?

When they fail, it’s one of the symptoms of the graphics card failure on HP Pavilion dv2000/dv6000/dv9000 laptops. @ Paul, Yes i am actually having troubles with wireless.

Sound works great though. I guess if it is video card it would eventually stop working all together. HP Pavilion dv2000/dv6000/dv9000 laptops are know for the graphics card failure.

One of the symptoms – the wireless card stops working. You turn on the wireless switch, but the LED remains orange (suppose to be blue).

Is it what you are experiencing? The graphics fails because NVIDIA chip separates from the motherboard. If that’s the case, the laptop not worth fixing because it’s necessary to replace the motherboard. @ Jake, I brought a replacement screen off Ebay to replace broken on my Sony Vaio. It comes on (dark) but the backlight doesn’t work. Did you have light on the broken screen?

If the original (cracked) screen was lighting up, you can try installing it again and see if the backlight still works. Maybe your new screen is defective. Screen vendor wants me to check a inverter fuse on the motherboard.

Not sure where it would be located and how feasible it would be to replace. Sorry cannot help here. I don’t fix motherboards on the component level. You cannot use just any inverter. It has to be married to your screen. Check the serial numbers on the back of your screen then look up the inverter part that GOES WITH THE SCREEN.

Then if that “matched” pair still don’t work it will be your motherboard since the chip on the motherboard for video is alien to the new set of screen and matching inverter. Unless of course you replaced the screen initially with the exact same screen this motherboard chip wants and purchased the exact precise inverter for that exact same replacement screen, all should work. If not, its the motherboard. But you can also buy these inverters that supposedly can translate these issues, but I dunno if they actually work.

Thinking of buying one to see. My laptop repair had all these problems as mentioned in this forum. Its so easy to overlook that WE might have been successful right from the start if we married our screens to their rightful inverters. Very important. Next if still doesn’t work, i’d change out the cable connector to these, and third if still no luck, its def the motherboard chip capability. Which shouldn’t be the case if the screen is the exact one the motherboard wants. Hi, I have got an Acer Extensa 4230.

The problem is that the screen freezes, getting lines, the image is not clear, top of the screen moves to the bottom, etc. Everything works as it should, just the screen freezes (laptop is operating normally during that time, just can’t see what is happening).

I did notice that when pressed the bottom of the screen where is the inverter it goes back and works fine for some time, seems to get better after warming up. Is it possible that the freezing and image distortion is a fault of faulty inverter? The laptop have been cleaned but it didn’t stop screen freezing.

The memory and hard drive are tested for errors. Screen seems to be working normally when pressed on the bottom of the screen in the middle (under actual LCD) as mentioned. It is just nobody mention those effects caused by faulty inverter. Is it inverter or something else? Thanks in advance.

Respected Sir, I am got a acer aspire e1-572g, its screen starts flickring on touching/moving the lid, so i open my laptop (diy) to fix if there is any bad connection b/w connectors. But than after screen is not working. When i starts my laptop its working fine but screen got little bit more darker in bottom ( half in dark grey and half part in black tone ) i am also able to hear the sound of startup window and playing songs/video but no screen also try one time to connect with external projector but no video output comes. Pls help and reply asap.